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linux curl命令手册_curl --path-as-is
作者：IT小白 | 2024-04-16 13:22:57
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curl --path-as-is
curl(1) curl Manual curl(1)
NAME
curl - transfer a URL
SYNOPSIS
curl [options / URLs]
DESCRIPTION
curl is a tool for transferring data from or to a server. It supports
these protocols: DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS,
IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP,
SFTP, SMB, SMBS, SMTP, SMTPS, TELNET or TFTP. The command is designed
to work without user interaction.
curl offers a busload of useful tricks like proxy support, user authen‐
tication, FTP upload, HTTP post, SSL connections, cookies, file trans‐
fer resume and more. As you will see below, the number of features will
make your head spin.
curl is powered by libcurl for all transfer-related features. See
libcurl(3) for details.
URL
The URL syntax is protocol-dependent. You find a detailed description
in RFC 3986.
You can specify multiple URLs or parts of URLs by writing part sets
within braces and quoting the URL as in:
"http://site.{one,two,three}.com"
or you can get sequences of alphanumeric series by using [] as in:
"ftp://ftp.example.com/file[1-100].txt"
"ftp://ftp.example.com/file[001-100].txt" (with leading zeros)
"ftp://ftp.example.com/file[a-z].txt"
Nested sequences are not supported, but you can use several ones next
to each other:
"http://example.com/archive[1996-1999]/vol[1-4]/part{a,b,c}.html"
You can specify any amount of URLs on the command line. They will be
fetched in a sequential manner in the specified order. You can specify
command line options and URLs mixed and in any order on the command
line.
You can specify a step counter for the ranges to get every Nth number
or letter:
"http://example.com/file[1-100:10].txt"
"http://example.com/file[a-z:2].txt"
When using [] or {} sequences when invoked from a command line prompt,
you probably have to put the full URL within double quotes to avoid the
shell from interfering with it. This also goes for other characters
treated special, like for example '&', '?' and '*'.
Provide the IPv6 zone index in the URL with an escaped percentage sign
and the interface name. Like in
"http://[fe80::3%25eth0]/"
If you specify URL without protocol:// prefix, curl will attempt to
guess what protocol you might want. It will then default to HTTP but
try other protocols based on often-used host name prefixes. For exam‐
ple, for host names starting with "ftp." curl will assume you want to
speak FTP.
curl will do its best to use what you pass to it as a URL. It is not
trying to validate it as a syntactically correct URL by any means but
is fairly liberal with what it accepts.
curl will attempt to re-use connections for multiple file transfers, so
that getting many files from the same server will not do multiple con‐
nects / handshakes. This improves speed. Of course this is only done on
files specified on a single command line and cannot be used between
separate curl invocations.
OUTPUT
If not told otherwise, curl writes the received data to stdout. It can
be instructed to instead save that data into a local file, using the
-o, --output or -O, --remote-name options. If curl is given multiple
URLs to transfer on the command line, it similarly needs multiple op‐
tions for where to save them.
curl does not parse or otherwise "understand" the content it gets or
writes as output. It does no encoding or decoding, unless explicitly
asked to with dedicated command line options.
PROTOCOLS
curl supports numerous protocols, or put in URL terms: schemes. Your
particular build may not support them all.
DICT Lets you lookup words using online dictionaries.
FILE Read or write local files. curl does not support accessing
file:// URL remotely, but when running on Microsoft Windows us‐
ing the native UNC approach will work.
FTP(S) curl supports the File Transfer Protocol with a lot of tweaks
and levers. With or without using TLS.
GOPHER(S)
Retrieve files.
HTTP(S)
curl supports HTTP with numerous options and variations. It can
speak HTTP version 0.9, 1.0, 1.1, 2 and 3 depending on build op‐
tions and the correct command line options.
IMAP(S)
Using the mail reading protocol, curl can "download" emails for
you. With or without using TLS.
LDAP(S)
curl can do directory lookups for you, with or without TLS.
MQTT curl supports MQTT version 3. Downloading over MQTT equals "sub‐
scribe" to a topic while uploading/posting equals "publish" on a
topic. MQTT over TLS is not supported (yet).
POP3(S)
Downloading from a pop3 server means getting a mail. With or
without using TLS.
RTMP(S)
The Realtime Messaging Protocol is primarily used to server
streaming media and curl can download it.
RTSP curl supports RTSP 1.0 downloads.
SCP curl supports SSH version 2 scp transfers.
SFTP curl supports SFTP (draft 5) done over SSH version 2.
SMB(S) curl supports SMB version 1 for upload and download.
SMTP(S)
Uploading contents to an SMTP server means sending an email.
With or without TLS.
TELNET Telling curl to fetch a telnet URL starts an interactive session
where it sends what it reads on stdin and outputs what the
server sends it.
TFTP curl can do TFTP downloads and uploads.
PROGRESS METER
curl normally displays a progress meter during operations, indicating
the amount of transferred data, transfer speeds and estimated time
left, etc. The progress meter displays number of bytes and the speeds
are in bytes per second. The suffixes (k, M, G, T, P) are 1024 based.
For example 1k is 1024 bytes. 1M is 1048576 bytes.
curl displays this data to the terminal by default, so if you invoke
curl to do an operation and it is about to write data to the terminal,
it disables the progress meter as otherwise it would mess up the output
mixing progress meter and response data.
If you want a progress meter for HTTP POST or PUT requests, you need to
redirect the response output to a file, using shell redirect (>), -o,
--output or similar.
This does not apply to FTP upload as that operation does not spit out
any response data to the terminal.
If you prefer a progress "bar" instead of the regular meter, -#,
--progress-bar is your friend. You can also disable the progress meter
completely with the -s, --silent option.
OPTIONS
Options start with one or two dashes. Many of the options require an
additional value next to them.
The short "single-dash" form of the options, -d for example, may be
used with or without a space between it and its value, although a space
is a recommended separator. The long "double-dash" form, -d, --data for
example, requires a space between it and its value.
Short version options that do not need any additional values can be
used immediately next to each other, like for example you can specify
all the options -O, -L and -v at once as -OLv.
In general, all boolean options are enabled with --option and yet again
disabled with --no-option. That is, you use the same option name but
prefix it with "no-". However, in this list we mostly only list and
show the --option version of them.
--abstract-unix-socket <path>
(HTTP) Connect through an abstract Unix domain socket, instead
of using the network. Note: netstat shows the path of an ab‐
stract socket prefixed with '@', however the <path> argument
should not have this leading character.
Example:
curl --abstract-unix-socket socketpath https://example.com
See also --unix-socket. Added in 7.53.0.
--alt-svc <file name>
(HTTPS) This option enables the alt-svc parser in curl. If the
file name points to an existing alt-svc cache file, that will be
used. After a completed transfer, the cache will be saved to the
file name again if it has been modified.
Specify a "" file name (zero length) to avoid loading/saving and
make curl just handle the cache in memory.
If this option is used several times, curl will load contents
from all the files but the last one will be used for saving.
Example:
curl --alt-svc svc.txt https://example.com
See also --resolve and --connect-to. Added in 7.64.1.
--anyauth
(HTTP) Tells curl to figure out authentication method by itself,
and use the most secure one the remote site claims to support.
This is done by first doing a request and checking the response-
headers, thus possibly inducing an extra network round-trip.
This is used instead of setting a specific authentication
method, which you can do with --basic, --digest, --ntlm, and
--negotiate.
Using --anyauth is not recommended if you do uploads from stdin,
since it may require data to be sent twice and then the client
must be able to rewind. If the need should arise when uploading
from stdin, the upload operation will fail.
Used together with -u, --user.
Example:
curl --anyauth --user me:pwd https://example.com
See also --proxy-anyauth, --basic and --digest.
-a, --append
(FTP SFTP) When used in an upload, this makes curl append to the
target file instead of overwriting it. If the remote file does
not exist, it will be created. Note that this flag is ignored by
some SFTP servers (including OpenSSH).
Example:
curl --upload-file local --append ftp://example.com/
See also -r, --range and -C, --continue-at.
--aws-sigv4 <provider1[:provider2[:region[:service]]]>
Use AWS V4 signature authentication in the transfer.
The provider argument is a string that is used by the algorithm
when creating outgoing authentication headers.
The region argument is a string that points to a geographic area
of a resources collection (region-code) when the region name is
omitted from the endpoint.
The service argument is a string that points to a function pro‐
vided by a cloud (service-code) when the service name is omitted
from the endpoint.
Example:
curl --aws-sigv4 "aws:amz:east-2:es" --user "key:secret" https://example.com
See also --basic and -u, --user. Added in 7.75.0.
--basic
(HTTP) Tells curl to use HTTP Basic authentication with the re‐
mote host. This is the default and this option is usually point‐
less, unless you use it to override a previously set option that
sets a different authentication method (such as --ntlm, --di‐
gest, or --negotiate).
Used together with -u, --user.
Example:
curl -u name:password --basic https://example.com
See also --proxy-basic.
--cacert <file>
(TLS) Tells curl to use the specified certificate file to verify
the peer. The file may contain multiple CA certificates. The
certificate(s) must be in PEM format. Normally curl is built to
use a default file for this, so this option is typically used to
alter that default file.
curl recognizes the environment variable named 'CURL_CA_BUNDLE'
if it is set, and uses the given path as a path to a CA cert
bundle. This option overrides that variable.
The windows version of curl will automatically look for a CA
certs file named 'curl-ca-bundle.crt', either in the same direc‐
tory as curl.exe, or in the Current Working Directory, or in any
folder along your PATH.
If curl is built against the NSS SSL library, the NSS PEM
PKCS#11 module (libnsspem.so) needs to be available for this op‐
tion to work properly.
(iOS and macOS only) If curl is built against Secure Transport,
then this option is supported for backward compatibility with
other SSL engines, but it should not be set. If the option is
not set, then curl will use the certificates in the system and
user Keychain to verify the peer, which is the preferred method
of verifying the peer's certificate chain.
(Schannel only) This option is supported for Schannel in Windows
7 or later with libcurl 7.60 or later. This option is supported
for backward compatibility with other SSL engines; instead it is
recommended to use Windows' store of root certificates (the de‐
fault for Schannel).
If this option is used several times, the last one will be used.
Example:
curl --cacert CA-file.txt https://example.com
See also --capath and -k, --insecure.
--capath <dir>
(TLS) Tells curl to use the specified certificate directory to
verify the peer. Multiple paths can be provided by separating
them with ":" (e.g. "path1:path2:path3"). The certificates must
be in PEM format, and if curl is built against OpenSSL, the di‐
rectory must have been processed using the c_rehash utility sup‐
plied with OpenSSL. Using --capath can allow OpenSSL-powered
curl to make SSL-connections much more efficiently than using
--cacert if the --cacert file contains many CA certificates.
If this option is set, the default capath value will be ignored,
and if it is used several times, the last one will be used.
Example:
curl --capath /local/directory https://example.com
See also --cacert and -k, --insecure.
--cert-status
(TLS) Tells curl to verify the status of the server certificate
by using the Certificate Status Request (aka. OCSP stapling) TLS
extension.
If this option is enabled and the server sends an invalid (e.g.
expired) response, if the response suggests that the server cer‐
tificate has been revoked, or no response at all is received,
the verification fails.
This is currently only implemented in the OpenSSL, GnuTLS and
NSS backends.
Example:
curl --cert-status https://example.com
See also --pinnedpubkey. Added in 7.41.0.
--cert-type <type>
(TLS) Tells curl what type the provided client certificate is
using. PEM, DER, ENG and P12 are recognized types. If not speci‐
fied, PEM is assumed.
If this option is used several times, the last one will be used.
Example:
curl --cert-type PEM --cert file https://example.com
See also -E, --cert, --key and --key-type.
-E, --cert <certificate[:password]>
(TLS) Tells curl to use the specified client certificate file
when getting a file with HTTPS, FTPS or another SSL-based proto‐
col. The certificate must be in PKCS#12 format if using Secure
Transport, or PEM format if using any other engine. If the op‐
tional password is not specified, it will be queried for on the
terminal. Note that this option assumes a "certificate" file
that is the private key and the client certificate concatenated!
See -E, --cert and --key to specify them independently.
If curl is built against the NSS SSL library then this option
can tell curl the nickname of the certificate to use within the
NSS database defined by the environment variable SSL_DIR (or by
default /etc/pki/nssdb). If the NSS PEM PKCS#11 module (lib‐
nsspem.so) is available then PEM files may be loaded. If you
want to use a file from the current directory, please precede it
with "./" prefix, in order to avoid confusion with a nickname.
If the nickname contains ":", it needs to be preceded by "\" so
that it is not recognized as password delimiter. If the nickname
contains "\", it needs to be escaped as "\\" so that it is not
recognized as an escape character.
If curl is built against OpenSSL library, and the engine pkcs11
is available, then a PKCS#11 URI (RFC 7512) can be used to spec‐
ify a certificate located in a PKCS#11 device. A string begin‐
ning with "pkcs11:" will be interpreted as a PKCS#11 URI. If a
PKCS#11 URI is provided, then the --engine option will be set as
"pkcs11" if none was provided and the --cert-type option will be
set as "ENG" if none was provided.
(iOS and macOS only) If curl is built against Secure Transport,
then the certificate string can either be the name of a certifi‐
cate/private key in the system or user keychain, or the path to
a PKCS#12-encoded certificate and private key. If you want to
use a file from the current directory, please precede it with
"./" prefix, in order to avoid confusion with a nickname.
(Schannel only) Client certificates must be specified by a path
expression to a certificate store. (Loading PFX is not sup‐
ported; you can import it to a store first). You can use "<store
location>\<store name>\<thumbprint>" to refer to a certificate
in the system certificates store, for example, "Curren‐
tUser\MY\934a7ac6f8a5d579285a74fa61e19f23ddfe8d7a". Thumbprint
is usually a SHA-1 hex string which you can see in certificate
details. Following store locations are supported: CurrentUser,
LocalMachine, CurrentService, Services, CurrentUserGroupPolicy,
LocalMachineGroupPolicy, LocalMachineEnterprise.
If this option is used several times, the last one will be used.
Example:
curl --cert certfile --key keyfile https://example.com
See also --cert-type, --key and --key-type.
--ciphers <list of ciphers>
(TLS) Specifies which ciphers to use in the connection. The list
of ciphers must specify valid ciphers. Read up on SSL cipher
list details on this URL:
https://curl.se/docs/ssl-ciphers.html
If this option is used several times, the last one will be used.
Example:
curl --ciphers ECDHE-ECDSA-AES256-CCM8 https://example.com
See also --tlsv1.3.
--compressed-ssh
(SCP SFTP) Enables built-in SSH compression. This is a request,
not an order; the server may or may not do it.
Example:
curl --compressed-ssh sftp://example.com/
See also --compressed. Added in 7.56.0.
--compressed
(HTTP) Request a compressed response using one of the algorithms
curl supports, and automatically decompress the content. Headers
are not modified.
If this option is used and the server sends an unsupported en‐
coding, curl will report an error. This is a request, not an or‐
der; the server may or may not deliver data compressed.
Example:
curl --compressed https://example.com
See also --compressed-ssh.
-K, --config <file>
Specify a text file to read curl arguments from. The command
line arguments found in the text file will be used as if they
were provided on the command line.
Options and their parameters must be specified on the same line
in the file, separated by whitespace, colon, or the equals sign.
Long option names can optionally be given in the config file
without the initial double dashes and if so, the colon or equals
characters can be used as separators. If the option is specified
with one or two dashes, there can be no colon or equals charac‐
ter between the option and its parameter.
If the parameter contains whitespace (or starts with : or =),
the parameter must be enclosed within quotes. Within double
quotes, the following escape sequences are available: \\, \",
\t, \n, \r and \v. A backslash preceding any other letter is ig‐
nored.
If the first column of a config line is a '#' character, the
rest of the line will be treated as a comment.
Only write one option per physical line in the config file.
Specify the filename to -K, --config as '-' to make curl read
the file from stdin.
Note that to be able to specify a URL in the config file, you
need to specify it using the --url option, and not by simply
writing the URL on its own line. So, it could look similar to
this:
url = "https://curl.se/docs/"
# --- Example file ---
# this is a comment
url = "example.com"
output = "curlhere.html"
user-agent = "superagent/1.0"
# and fetch another URL too
url = "example.com/docs/manpage.html"
-O
referer = "http://nowhereatall.example.com/"
# --- End of example file ---
When curl is invoked, it (unless -q, --disable is used) checks
for a default config file and uses it if found, even when -K,
--config is used. The default config file is checked for in the
following places in this order:
1) "$CURL_HOME/.curlrc"
2) "$XDG_CONFIG_HOME/.curlrc" (Added in 7.73.0)
3) "$HOME/.curlrc"
4) Windows: "%USERPROFILE%\.curlrc"
5) Windows: "%APPDATA%\.curlrc"
6) Windows: "%USERPROFILE%\Application Data\.curlrc"
7) Non-windows: use getpwuid to find the home directory
8) On windows, if it finds no .curlrc file in the sequence de‐
scribed above, it checks for one in the same dir the curl exe‐
cutable is placed.
This option can be used multiple times to load multiple config
files.
Example:
curl --config file.txt https://example.com
See also -q, --disable.
--connect-timeout <fractional seconds>
Maximum time in seconds that you allow curl's connection to
take. This only limits the connection phase, so if curl con‐
nects within the given period it will continue - if not it will
exit. Since version 7.32.0, this option accepts decimal values.
If this option is used several times, the last one will be used.
Examples:
curl --connect-timeout 20 https://example.com
curl --connect-timeout 3.14 https://example.com
See also -m, --max-time.
--connect-to <HOST1:PORT1:HOST2:PORT2>
For a request to the given HOST1:PORT1 pair, connect to
HOST2:PORT2 instead. This option is suitable to direct requests
at a specific server, e.g. at a specific cluster node in a clus‐
ter of servers. This option is only used to establish the net‐
work connection. It does NOT affect the hostname/port that is
used for TLS/SSL (e.g. SNI, certificate verification) or for the
application protocols. "HOST1" and "PORT1" may be the empty
string, meaning "any host/port". "HOST2" and "PORT2" may also be
the empty string, meaning "use the request's original
host/port".
A "host" specified to this option is compared as a string, so it
needs to match the name used in request URL. It can be either
numerical such as "127.0.0.1" or the full host name such as "ex‐
ample.org".
This option can be used many times to add many connect rules.
Example:
curl --connect-to example.com:443:example.net:8443 https://example.com
See also --resolve and -H, --header. Added in 7.49.0.
-C, --continue-at <offset>
Continue/Resume a previous file transfer at the given offset.
The given offset is the exact number of bytes that will be
skipped, counting from the beginning of the source file before
it is transferred to the destination. If used with uploads, the
FTP server command SIZE will not be used by curl.
Use "-C -" to tell curl to automatically find out where/how to
resume the transfer. It then uses the given output/input files
to figure that out.
If this option is used several times, the last one will be used.
Examples:
curl -C - https://example.com
curl -C 400 https://example.com
See also -r, --range.
-c, --cookie-jar <filename>
(HTTP) Specify to which file you want curl to write all cookies
after a completed operation. Curl writes all cookies from its
in-memory cookie storage to the given file at the end of opera‐
tions. If no cookies are known, no data will be written. The
file will be written using the Netscape cookie file format. If
you set the file name to a single dash, "-", the cookies will be
written to stdout.
This command line option will activate the cookie engine that
makes curl record and use cookies. Another way to activate it is
to use the -b, --cookie option.
If the cookie jar cannot be created or written to, the whole
curl operation will not fail or even report an error clearly.
Using -v, --verbose will get a warning displayed, but that is
the only visible feedback you get about this possibly lethal
situation.
If this option is used several times, the last specified file
name will be used.
Examples:
curl -c store-here.txt https://example.com
curl -c store-here.txt -b read-these https://example.com
See also -b, --cookie.
-b, --cookie <data|filename>
(HTTP) Pass the data to the HTTP server in the Cookie header. It
is supposedly the data previously received from the server in a
"Set-Cookie:" line. The data should be in the format
"NAME1=VALUE1; NAME2=VALUE2".
If no '=' symbol is used in the argument, it is instead treated
as a filename to read previously stored cookie from. This option
also activates the cookie engine which will make curl record in‐
coming cookies, which may be handy if you are using this in com‐
bination with the -L, --location option or do multiple URL
transfers on the same invoke. If the file name is exactly a mi‐
nus ("-"), curl will instead read the contents from stdin.
The file format of the file to read cookies from should be plain
HTTP headers (Set-Cookie style) or the Netscape/Mozilla cookie
file format.
The file specified with -b, --cookie is only used as input. No
cookies will be written to the file. To store cookies, use the
-c, --cookie-jar option.
If you use the Set-Cookie file format and do not specify a do‐
main then the cookie is not sent since the domain will never
match. To address this, set a domain in Set-Cookie line (doing
that will include sub-domains) or preferably: use the Netscape
format.
This option can be used multiple times.
Users often want to both read cookies from a file and write up‐
dated cookies back to a file, so using both -b, --cookie and -c,
--cookie-jar in the same command line is common.
Examples:
curl -b cookiefile https://example.com
curl -b cookiefile -c cookiefile https://example.com
See also -c, --cookie-jar and -j, --junk-session-cookies.
--create-dirs
When used in conjunction with the -o, --output option, curl will
create the necessary local directory hierarchy as needed. This
option creates the directories mentioned with the -o, --output
option, nothing else. If the --output file name uses no direc‐
tory, or if the directories it mentions already exist, no direc‐
tories will be created.
Created dirs are made with mode 0750 on unix style file systems.
To create remote directories when using FTP or SFTP, try --ftp-
create-dirs.
Example:
curl --create-dirs --output local/dir/file https://example.com
See also --ftp-create-dirs and --output-dir.
--create-file-mode <mode>
(SFTP SCP FILE) When curl is used to create files remotely using
one of the supported protocols, this option allows the user to
set which 'mode' to set on the file at creation time, instead of
the default 0644.
This option takes an octal number as argument.
If this option is used several times, the last one will be used.
Example:
curl --create-file-mode 0777 -T localfile sftp://example.com/new
See also --ftp-create-dirs. Added in 7.75.0.
--crlf (FTP SMTP) Convert LF to CRLF in upload. Useful for MVS
(OS/390).
(SMTP added in 7.40.0)
Example:
curl --crlf -T file ftp://example.com/
See also -B, --use-ascii.
--crlfile <file>
(TLS) Provide a file using PEM format with a Certificate Revoca‐
tion List that may specify peer certificates that are to be con‐
sidered revoked.
If this option is used several times, the last one will be used.
Example:
curl --crlfile rejects.txt https://example.com
See also --cacert and --capath.
--curves <algorithm list>
(TLS) Tells curl to request specific curves to use during SSL
session establishment according to RFC 8422, 5.1. Multiple al‐
gorithms can be provided by separating them with ":" (e.g.
"X25519:P-521"). The parameter is available identically in the
"openssl s_client/s_server" utilities.
--curves allows a OpenSSL powered curl to make SSL-connections
with exactly the (EC) curve requested by the client, avoiding
nontransparent client/server negotiations.
If this option is set, the default curves list built into
openssl will be ignored.
Example:
curl --curves X25519 https://example.com
See also --ciphers. Added in 7.73.0.
--data-ascii <data>
(HTTP) This is just an alias for -d, --data.
Example:
curl --data-ascii @file https://example.com
See also --data-binary, --data-raw and --data-urlencode.
--data-binary <data>
(HTTP) This posts data exactly as specified with no extra pro‐
cessing whatsoever.
If you start the data with the letter @, the rest should be a
filename. Data is posted in a similar manner as -d, --data does,
except that newlines and carriage returns are preserved and con‐
versions are never done.
Like -d, --data the default content-type sent to the server is
application/x-www-form-urlencoded. If you want the data to be
treated as arbitrary binary data by the server then set the con‐
tent-type to octet-stream: -H "Content-Type: application/octet-
stream".
If this option is used several times, the ones following the
first will append data as described in -d, --data.
Example:
curl --data-binary @filename https://example.com
See also --data-ascii.
--data-raw <data>
(HTTP) This posts data similarly to -d, --data but without the
special interpretation of the @ character.
Examples:
curl --data-raw "hello" https://example.com
curl --data-raw "@at@at@" https://example.com
See also -d, --data. Added in 7.43.0.
--data-urlencode <data>
(HTTP) This posts data, similar to the other -d, --data options
with the exception that this performs URL-encoding.
To be CGI-compliant, the <data> part should begin with a name
followed by a separator and a content specification. The <data>
part can be passed to curl using one of the following syntaxes:
content
This will make curl URL-encode the content and pass that
on. Just be careful so that the content does not contain
any = or @ symbols, as that will then make the syntax
match one of the other cases below!
=content
This will make curl URL-encode the content and pass that
on. The preceding = symbol is not included in the data.
name=content
This will make curl URL-encode the content part and pass
that on. Note that the name part is expected to be URL-
encoded already.
@filename
This will make curl load data from the given file (in‐
cluding any newlines), URL-encode that data and pass it
on in the POST.
name@filename
This will make curl load data from the given file (in‐
cluding any newlines), URL-encode that data and pass it
on in the POST. The name part gets an equal sign ap‐
pended, resulting in name=urlencoded-file-content. Note
that the name is expected to be URL-encoded already.
Examples:
curl --data-urlencode name=val https://example.com
curl --data-urlencode =encodethis https://example.com
curl --data-urlencode name@file https://example.com
curl --data-urlencode @fileonly https://example.com
See also -d, --data and --data-raw.
-d, --data <data>
(HTTP MQTT) Sends the specified data in a POST request to the
HTTP server, in the same way that a browser does when a user has
filled in an HTML form and presses the submit button. This will
cause curl to pass the data to the server using the content-type
application/x-www-form-urlencoded. Compare to -F, --form.
--data-raw is almost the same but does not have a special inter‐
pretation of the @ character. To post data purely binary, you
should instead use the --data-binary option. To URL-encode the
value of a form field you may use --data-urlencode.
If any of these options is used more than once on the same com‐
mand line, the data pieces specified will be merged with a sepa‐
rating &-symbol. Thus, using '-d name=daniel -d skill=lousy'
would generate a post chunk that looks like
'name=daniel&skill=lousy'.
If you start the data with the letter @, the rest should be a
file name to read the data from, or - if you want curl to read
the data from stdin. Posting data from a file named 'foobar'
would thus be done with -d, --data @foobar. When -d, --data is
told to read from a file like that, carriage returns and new‐
lines will be stripped out. If you do not want the @ character
to have a special interpretation use --data-raw instead.
Examples:
curl -d "name=curl" https://example.com
curl -d "name=curl" -d "tool=cmdline" https://example.com
curl -d @filename https://example.com
See also --data-binary, --data-urlencode and --data-raw. This
option overrides -F, --form and -I, --head and -T, --upload-
file.
--delegation <LEVEL>
(GSS/kerberos) Set LEVEL to tell the server what it is allowed
to delegate when it comes to user credentials.
none Do not allow any delegation.
policy Delegates if and only if the OK-AS-DELEGATE flag is set
in the Kerberos service ticket, which is a matter of
realm policy.
always Unconditionally allow the server to delegate.
If this option is used several times, the last one will be used.
Example:
curl --delegation "none" https://example.com
See also -k, --insecure and --ssl.
--digest
(HTTP) Enables HTTP Digest authentication. This is an authenti‐
cation scheme that prevents the password from being sent over
the wire in clear text. Use this in combination with the normal
-u, --user option to set user name and password.
If this option is used several times, only the first one is
used.
Example:
curl -u name:password --digest https://example.com
See also -u, --user, --proxy-digest and --anyauth. This option
overrides --basic and --ntlm and --negotiate.
--disable-eprt
(FTP) Tell curl to disable the use of the EPRT and LPRT commands
when doing active FTP transfers. Curl will normally always first
attempt to use EPRT, then LPRT before using PORT, but with this
option, it will use PORT right away. EPRT and LPRT are exten‐
sions to the original FTP protocol, and may not work on all
servers, but they enable more functionality in a better way than
the traditional PORT command.
--eprt can be used to explicitly enable EPRT again and --no-eprt
is an alias for --disable-eprt.
If the server is accessed using IPv6, this option will have no
effect as EPRT is necessary then.
Disabling EPRT only changes the active behavior. If you want to
switch to passive mode you need to not use -P, --ftp-port or
force it with --ftp-pasv.
Example:
curl --disable-eprt ftp://example.com/
See also --disable-epsv and -P, --ftp-port.
--disable-epsv
(FTP) Tell curl to disable the use of the EPSV command when do‐
ing passive FTP transfers. Curl will normally always first at‐
tempt to use EPSV before PASV, but with this option, it will not
try using EPSV.
--epsv can be used to explicitly enable EPSV again and --no-epsv
is an alias for --disable-epsv.
If the server is an IPv6 host, this option will have no effect
as EPSV is necessary then.
Disabling EPSV only changes the passive behavior. If you want to
switch to active mode you need to use -P, --ftp-port.
Example:
curl --disable-epsv ftp://example.com/
See also --disable-eprt and -P, --ftp-port.
-q, --disable
If used as the first parameter on the command line, the curlrc
config file will not be read and used. See the -K, --config for
details on the default config file search path.
Example:
curl -q https://example.com
See also -K, --config.
--disallow-username-in-url
(HTTP) This tells curl to exit if passed a url containing a
username. This is probably most useful when the URL is being
provided at run-time or similar.
Example:
curl --disallow-username-in-url https://example.com
See also --proto. Added in 7.61.0.
--dns-interface <interface>
(DNS) Tell curl to send outgoing DNS requests through <inter‐
face>. This option is a counterpart to --interface (which does
not affect DNS). The supplied string must be an interface name
(not an address).
Example:
curl --dns-interface eth0 https://example.com
See also --dns-ipv4-addr and --dns-ipv6-addr. --dns-interface
requires that the underlying libcurl was built to support c-
ares. Added in 7.33.0.
--dns-ipv4-addr <address>
(DNS) Tell curl to bind to <ip-address> when making IPv4 DNS re‐
quests, so that the DNS requests originate from this address.
The argument should be a single IPv4 address.
If this option is used several times, the last one will be used.
Example:
curl --dns-ipv4-addr 10.1.2.3 https://example.com
See also --dns-interface and --dns-ipv6-addr. --dns-ipv4-addr
requires that the underlying libcurl was built to support c-
ares. Added in 7.33.0.
--dns-ipv6-addr <address>
(DNS) Tell curl to bind to <ip-address> when making IPv6 DNS re‐
quests, so that the DNS requests originate from this address.
The argument should be a single IPv6 address.
If this option is used several times, the last one will be used.
Example:
curl --dns-ipv6-addr 2a04:4e42::561 https://example.com
See also --dns-interface and --dns-ipv4-addr. --dns-ipv6-addr
requires that the underlying libcurl was built to support c-
ares. Added in 7.33.0.
--dns-servers <addresses>
Set the list of DNS servers to be used instead of the system de‐
fault. The list of IP addresses should be separated with com‐
mas. Port numbers may also optionally be given as :<port-number>
after each IP address.
If this option is used several times, the last one will be used.
Example:
curl --dns-servers 192.168.0.1,192.168.0.2 https://example.com
See also --dns-interface and --dns-ipv4-addr. --dns-servers re‐
quires that the underlying libcurl was built to support c-ares.
Added in 7.33.0.
--doh-cert-status
Same as --cert-status but used for DoH (DNS-over-HTTPS).
Example:
curl --doh-cert-status --doh-url https://doh.example https://example.com
See also --doh-insecure. Added in 7.76.0.
--doh-insecure
Same as -k, --insecure but used for DoH (DNS-over-HTTPS).
Example:
curl --doh-insecure --doh-url https://doh.example https://example.com
See also --doh-url. Added in 7.76.0.
--doh-url <URL>
Specifies which DNS-over-HTTPS (DoH) server to use to resolve
hostnames, instead of using the default name resolver mechanism.
The URL must be HTTPS.
Some SSL options that you set for your transfer will apply to
DoH since the name lookups take place over SSL. However, the
certificate verification settings are not inherited and can be
controlled separately via --doh-insecure and --doh-cert-status.
If this option is used several times, the last one will be used.
Example:
curl --doh-url https://doh.example https://example.com
See also --doh-insecure. Added in 7.62.0.
-D, --dump-header <filename>
(HTTP FTP) Write the received protocol headers to the specified
file. If no headers are received, the use of this option will
create an empty file.
When used in FTP, the FTP server response lines are considered
being "headers" and thus are saved there.
If this option is used several times, the last one will be used.
Example:
curl --dump-header store.txt https://example.com
See also -o, --output.
--egd-file <file>
(TLS) Specify the path name to the Entropy Gathering Daemon
socket. The socket is used to seed the random engine for SSL
connections.
Example:
curl --egd-file /random/here https://example.com
See also --random-file.
--engine <name>
(TLS) Select the OpenSSL crypto engine to use for cipher opera‐
tions. Use --engine list to print a list of build-time supported
engines. Note that not all (and possibly none) of the engines
may be available at run-time.
Example:
curl --engine flavor https://example.com
See also --ciphers and --curves.
--etag-compare <file>
(HTTP) This option makes a conditional HTTP request for the spe‐
cific ETag read from the given file by sending a custom If-None-
Match header using the stored ETag.
For correct results, make sure that the specified file contains
only a single line with the desired ETag. An empty file is
parsed as an empty ETag.
Use the option --etag-save to first save the ETag from a re‐
sponse, and then use this option to compare against the saved
ETag in a subsequent request.
Example:
curl --etag-compare etag.txt https://example.com
See also --etag-save and -z, --time-cond. Added in 7.68.0.
--etag-save <file>
(HTTP) This option saves an HTTP ETag to the specified file. An
ETag is a caching related header, usually returned in a re‐
sponse.
If no ETag is sent by the server, an empty file is created.
Example:
curl --etag-save storetag.txt https://example.com
See also --etag-compare. Added in 7.68.0.
--expect100-timeout <seconds>
(HTTP) Maximum time in seconds that you allow curl to wait for a
100-continue response when curl emits an Expects: 100-continue
header in its request. By default curl will wait one second.
This option accepts decimal values! When curl stops waiting, it
will continue as if the response has been received.
Example:
curl --expect100-timeout 2.5 -T file https://example.com
See also --connect-timeout. Added in 7.47.0.
--fail-early
Fail and exit on the first detected transfer error.
When curl is used to do multiple transfers on the command line,
it will attempt to operate on each given URL, one by one. By de‐
fault, it will ignore errors if there are more URLs given and
the last URL's success will determine the error code curl re‐
turns. So early failures will be "hidden" by subsequent success‐
ful transfers.
Using this option, curl will instead return an error on the
first transfer that fails, independent of the amount of URLs
that are given on the command line. This way, no transfer fail‐
ures go undetected by scripts and similar.
This option is global and does not need to be specified for each
use of -:, --next.
This option does not imply -f, --fail, which causes transfers to
fail due to the server's HTTP status code. You can combine the
two options, however note -f, --fail is not global and is there‐
fore contained by -:, --next.
Example:
curl --fail-early https://example.com https://two.example
See also -f, --fail and --fail-with-body. Added in 7.52.0.
--fail-with-body
(HTTP) Return an error on server errors where the HTTP response
code is 400 or greater). In normal cases when an HTTP server
fails to deliver a document, it returns an HTML document stating
so (which often also describes why and more). This flag will
still allow curl to output and save that content but also to re‐
turn error 22.
This is an alternative option to -f, --fail which makes curl
fail for the same circumstances but without saving the content.
Example:
curl --fail-with-body https://example.com
See also -f, --fail. Added in 7.76.0.
-f, --fail
(HTTP) Fail silently (no output at all) on server errors. This
is mostly done to enable scripts etc to better deal with failed
attempts. In normal cases when an HTTP server fails to deliver a
document, it returns an HTML document stating so (which often
also describes why and more). This flag will prevent curl from
outputting that and return error 22.
This method is not fail-safe and there are occasions where non-
successful response codes will slip through, especially when au‐
thentication is involved (response codes 401 and 407).
Example:
curl --fail https://example.com
See also --fail-with-body.
--false-start
(TLS) Tells curl to use false start during the TLS handshake.
False start is a mode where a TLS client will start sending ap‐
plication data before verifying the server's Finished message,
thus saving a round trip when performing a full handshake.
This is currently only implemented in the NSS and Secure Trans‐
port (on iOS 7.0 or later, or OS X 10.9 or later) backends.
Example:
curl --false-start https://example.com
See also --tcp-fastopen. Added in 7.42.0.
--form-escape
(HTTP) Tells curl to pass on names of multipart form fields and
files using backslash-escaping instead of percent-encoding.
Example:
curl --form-escape --form 'field\name=curl' 'file=@load"this' https://example.com
See also -F, --form. Added in 7.81.0.
--form-string <name=string>
(HTTP SMTP IMAP) Similar to -F, --form except that the value
string for the named parameter is used literally. Leading '@'
and '<' characters, and the ';type=' string in the value have no
special meaning. Use this in preference to -F, --form if there's
any possibility that the string value may accidentally trigger
the '@' or '<' features of -F, --form.
Example:
curl --form-string "data" https://example.com
See also -F, --form.
-F, --form <name=content>
(HTTP SMTP IMAP) For HTTP protocol family, this lets curl emu‐
late a filled-in form in which a user has pressed the submit
button. This causes curl to POST data using the Content-Type
multipart/form-data according to RFC 2388.
For SMTP and IMAP protocols, this is the means to compose a mul‐
tipart mail message to transmit.
This enables uploading of binary files etc. To force the 'con‐
tent' part to be a file, prefix the file name with an @ sign. To
just get the content part from a file, prefix the file name with
the symbol <. The difference between @ and < is then that @
makes a file get attached in the post as a file upload, while
the < makes a text field and just get the contents for that text
field from a file.
Tell curl to read content from stdin instead of a file by using
- as filename. This goes for both @ and < constructs. When stdin
is used, the contents is buffered in memory first by curl to de‐
termine its size and allow a possible resend. Defining a part's
data from a named non-regular file (such as a named pipe or sim‐
ilar) is unfortunately not subject to buffering and will be ef‐
fectively read at transmission time; since the full size is un‐
known before the transfer starts, such data is sent as chunks by
HTTP and rejected by IMAP.
Example: send an image to an HTTP server, where 'profile' is the
name of the form-field to which the file portrait.jpg will be
the input:
curl -F profile=@portrait.jpg https://example.com/upload.cgi
Example: send your name and shoe size in two text fields to the
server:
curl -F name=John -F shoesize=11 https://example.com/
Example: send your essay in a text field to the server. Send it
as a plain text field, but get the contents for it from a local
file:
curl -F "story=<hugefile.txt" https://example.com/
You can also tell curl what Content-Type to use by using
'type=', in a manner similar to:
curl -F "web=@index.html;type=text/html" example.com
or
curl -F "name=daniel;type=text/foo" example.com
You can also explicitly change the name field of a file upload
part by setting filename=, like this:
curl -F "file=@localfile;filename=nameinpost" example.com
If filename/path contains ',' or ';', it must be quoted by dou‐
ble-quotes like:
curl -F "file=@\"local,file\";filename=\"name;in;post\"" example.com
or
curl -F 'file=@"local,file";filename="name;in;post"' example.com
Note that if a filename/path is quoted by double-quotes, any
double-quote or backslash within the filename must be escaped by
backslash.
Quoting must also be applied to non-file data if it contains
semicolons, leading/trailing spaces or leading double quotes:
curl -F 'colors="red; green; blue";type=text/x-myapp' example.com
You can add custom headers to the field by setting headers=,
like
curl -F "submit=OK;headers=\"X-submit-type: OK\"" example.com
or
curl -F "submit=OK;headers=@headerfile" example.com
The headers= keyword may appear more that once and above notes
about quoting apply. When headers are read from a file, Empty
lines and lines starting with '#' are comments and ignored; each
header can be folded by splitting between two words and starting
the continuation line with a space; embedded carriage-returns
and trailing spaces are stripped. Here is an example of a
header file contents:
# This file contain two headers.
X-header-1: this is a header
# The following header is folded.
X-header-2: this is
another header
To support sending multipart mail messages, the syntax is ex‐
tended as follows:
- name can be omitted: the equal sign is the first character of
the argument,
- if data starts with '(', this signals to start a new multi‐
part: it can be followed by a content type specification.
- a multipart can be terminated with a '=)' argument.
Example: the following command sends an SMTP mime email consist‐
ing in an inline part in two alternative formats: plain text and
HTML. It attaches a text file:
curl -F '=(;type=multipart/alternative' \
-F '=plain text message' \
-F '= <body>HTML message</body>;type=text/html' \
-F '=)' -F '=@textfile.txt' ... smtp://example.com
Data can be encoded for transfer using encoder=. Available en‐
codings are binary and 8bit that do nothing else than adding the
corresponding Content-Transfer-Encoding header, 7bit that only
rejects 8-bit characters with a transfer error, quoted-printable
and base64 that encodes data according to the corresponding
schemes, limiting lines length to 76 characters.
Example: send multipart mail with a quoted-printable text mes‐
sage and a base64 attached file:
curl -F '=text message;encoder=quoted-printable' \
-F '=@localfile;encoder=base64' ... smtp://example.com
See further examples and details in the MANUAL.
This option can be used multiple times.
Example:
curl --form "name=curl" --form "file=@loadthis" https://example.com
See also -d, --data, --form-string and --form-escape. This op‐
tion overrides -d, --data and -I, --head and -T, --upload-file.
--ftp-account <data>
(FTP) When an FTP server asks for "account data" after user name
and password has been provided, this data is sent off using the
ACCT command.
If this option is used several times, the last one will be used.
Example:
curl --ftp-account "mr.robot" ftp://example.com/
See also -u, --user.
--ftp-alternative-to-user <command>
(FTP) If authenticating with the USER and PASS commands fails,
send this command. When connecting to Tumbleweed's Secure
Transport server over FTPS using a client certificate, using
"SITE AUTH" will tell the server to retrieve the username from
the certificate.
Example:
curl --ftp-alternative-to-user "U53r" ftp://example.com
See also --ftp-account and -u, --user.
--ftp-create-dirs
(FTP SFTP) When an FTP or SFTP URL/operation uses a path that
does not currently exist on the server, the standard behavior of
curl is to fail. Using this option, curl will instead attempt to
create missing directories.
Example:
curl --ftp-create-dirs -T file ftp://example.com/remote/path/file
See also --create-dirs.
--ftp-method <method>
(FTP) Control what method curl should use to reach a file on an
FTP(S) server. The method argument should be one of the follow‐
ing alternatives:
multicwd
curl does a single CWD operation for each path part in
the given URL. For deep hierarchies this means many com‐
mands. This is how RFC 1738 says it should be done. This
is the default but the slowest behavior.
nocwd curl does no CWD at all. curl will do SIZE, RETR, STOR
etc and give a full path to the server for all these com‐
mands. This is the fastest behavior.
singlecwd
curl does one CWD with the full target directory and then
operates on the file "normally" (like in the multicwd
case). This is somewhat more standards compliant than
'nocwd' but without the full penalty of 'multicwd'.
Examples:
curl --ftp-method multicwd ftp://example.com/dir1/dir2/file
curl --ftp-method nocwd ftp://example.com/dir1/dir2/file
curl --ftp-method singlecwd ftp://example.com/dir1/dir2/file
See also -l, --list-only.
--ftp-pasv
(FTP) Use passive mode for the data connection. Passive is the
internal default behavior, but using this option can be used to
override a previous -P, --ftp-port option.
If this option is used several times, only the first one is
used. Undoing an enforced passive really is not doable but you
must then instead enforce the correct -P, --ftp-port again.
Passive mode means that curl will try the EPSV command first and
then PASV, unless --disable-epsv is used.
Example:
curl --ftp-pasv ftp://example.com/
See also --disable-epsv.
-P, --ftp-port <address>
(FTP) Reverses the default initiator/listener roles when con‐
necting with FTP. This option makes curl use active mode. curl
then tells the server to connect back to the client's specified
address and port, while passive mode asks the server to setup an
IP address and port for it to connect to. <address> should be
one of:
interface
e.g. "eth0" to specify which interface's IP address you
want to use (Unix only)
IP address
e.g. "192.168.10.1" to specify the exact IP address
host name
e.g. "my.host.domain" to specify the machine
- make curl pick the same IP address that is already used
for the control connection
If this option is used several times, the last one will be used. Dis‐
able the use of PORT with --ftp-pasv. Disable the attempt to use the
EPRT command instead of PORT by using --disable-eprt. EPRT is really
PORT++.
You can also append ":[start]-[end]" to the right of the address, to
tell curl what TCP port range to use. That means you specify a port
range, from a lower to a higher number. A single number works as well,
but do note that it increases the risk of failure since the port may
not be available.
Examples:
curl -P - ftp:/example.com
curl -P eth0 ftp:/example.com
curl -P 192.168.0.2 ftp:/example.com
See also --ftp-pasv and --disable-eprt.
--ftp-pret
(FTP) Tell curl to send a PRET command before PASV (and EPSV).
Certain FTP servers, mainly drftpd, require this non-standard
command for directory listings as well as up and downloads in
PASV mode.
Example:
curl --ftp-pret ftp://example.com/
See also -P, --ftp-port and --ftp-pasv.
--ftp-skip-pasv-ip
(FTP) Tell curl to not use the IP address the server suggests in
its response to curl's PASV command when curl connects the data
connection. Instead curl will re-use the same IP address it al‐
ready uses for the control connection.
Since curl 7.74.0 this option is enabled by default.
This option has no effect if PORT, EPRT or EPSV is used instead
of PASV.
Example:
curl --ftp-skip-pasv-ip ftp://example.com/
See also --ftp-pasv.
--ftp-ssl-ccc-mode <active/passive>
(FTP) Sets the CCC mode. The passive mode will not initiate the
shutdown, but instead wait for the server to do it, and will not
reply to the shutdown from the server. The active mode initiates
the shutdown and waits for a reply from the server.
Example:
curl --ftp-ssl-ccc-mode active --ftp-ssl-ccc ftps://example.com/
See also --ftp-ssl-ccc.
--ftp-ssl-ccc
(FTP) Use CCC (Clear Command Channel) Shuts down the SSL/TLS
layer after authenticating. The rest of the control channel com‐
munication will be unencrypted. This allows NAT routers to fol‐
low the FTP transaction. The default mode is passive.
Example:
curl --ftp-ssl-ccc ftps://example.com/
See also --ssl and --ftp-ssl-ccc-mode.
--ftp-ssl-control
(FTP) Require SSL/TLS for the FTP login, clear for transfer.
Allows secure authentication, but non-encrypted data transfers
for efficiency. Fails the transfer if the server does not sup‐
port SSL/TLS.
Example:
curl --ftp-ssl-control ftp://example.com
See also --ssl.
-G, --get
When used, this option will make all data specified with -d,
--data, --data-binary or --data-urlencode to be used in an HTTP
GET request instead of the POST request that otherwise would be
used. The data will be appended to the URL with a '?' separator.
If used in combination with -I, --head, the POST data will in‐
stead be appended to the URL with a HEAD request.
If this option is used several times, only the first one is
used. This is because undoing a GET does not make sense, but you
should then instead enforce the alternative method you prefer.
Examples:
curl --get https://example.com
curl --get -d "tool=curl" -d "age=old" https://example.com
curl --get -I -d "tool=curl" https://example.com
See also -d, --data and -X, --request.
-g, --globoff
This option switches off the "URL globbing parser". When you set
this option, you can specify URLs that contain the letters {}[]
without having curl itself interpret them. Note that these let‐
ters are not normal legal URL contents but they should be en‐
coded according to the URI standard.
Example:
curl -g "https://example.com/{[]}}}}"
See also -K, --config and -q, --disable.
--happy-eyeballs-timeout-ms <milliseconds>
Happy Eyeballs is an algorithm that attempts to connect to both
IPv4 and IPv6 addresses for dual-stack hosts, giving IPv6 a
head-start of the specified number of milliseconds. If the IPv6
address cannot be connected to within that time, then a connec‐
tion attempt is made to the IPv4 address in parallel. The first
connection to be established is the one that is used.
The range of suggested useful values is limited. Happy Eyeballs
RFC 6555 says "It is RECOMMENDED that connection attempts be
paced 150-250 ms apart to balance human factors against network
load." libcurl currently defaults to 200 ms. Firefox and Chrome
currently default to 300 ms.
If this option is used several times, the last one will be used.
Example:
curl --happy-eyeballs-timeout-ms 500 https://example.com
See also -m, --max-time and --connect-timeout. Added in 7.59.0.
--haproxy-protocol
(HTTP) Send a HAProxy PROXY protocol v1 header at the beginning
of the connection. This is used by some load balancers and re‐
verse proxies to indicate the client's true IP address and port.
This option is primarily useful when sending test requests to a
service that expects this header.
Example:
curl --haproxy-protocol https://example.com
See also -x, --proxy. Added in 7.60.0.
-I, --head
(HTTP FTP FILE) Fetch the headers only! HTTP-servers feature the
command HEAD which this uses to get nothing but the header of a
document. When used on an FTP or FILE file, curl displays the
file size and last modification time only.
Example:
curl -I https://example.com
See also -G, --get, -v, --verbose and --trace-ascii.
-H, --header <header/@file>
(HTTP) Extra header to include in the request when sending HTTP
to a server. You may specify any number of extra headers. Note
that if you should add a custom header that has the same name as
one of the internal ones curl would use, your externally set
header will be used instead of the internal one. This allows you
to make even trickier stuff than curl would normally do. You
should not replace internally set headers without knowing per‐
fectly well what you are doing. Remove an internal header by
giving a replacement without content on the right side of the
colon, as in: -H "Host:". If you send the custom header with no-
value then its header must be terminated with a semicolon, such
as -H "X-Custom-Header;" to send "X-Custom-Header:".
curl will make sure that each header you add/replace is sent
with the proper end-of-line marker, you should thus not add that
as a part of the header content: do not add newlines or carriage
returns, they will only mess things up for you.
This option can take an argument in @filename style, which then
adds a header for each line in the input file. Using @- will
make curl read the header file from stdin. Added in 7.55.0.
You need --proxy-header to send custom headers intended for a
HTTP proxy. Added in 7.37.0.
Passing on a "Transfer-Encoding: chunked" header when doing a
HTTP request with a request body, will make curl send the data
using chunked encoding.
WARNING: headers set with this option will be set in all re‐
quests - even after redirects are followed, like when told with
-L, --location. This can lead to the header being sent to other
hosts than the original host, so sensitive headers should be
used with caution combined with following redirects.
This option can be used multiple times to add/replace/remove
multiple headers.
Examples:
curl -H "X-First-Name: Joe" https://example.com
curl -H "User-Agent: yes-please/2000" https://example.com
curl -H "Host:" https://example.com
See also -A, --user-agent and -e, --referer.
-h, --help <category>
Usage help. This lists all commands of the <category>. If no
arg was provided, curl will display the most important command
line arguments. If the argument "all" was provided, curl will
display all options available. If the argument "category" was
provided, curl will display all categories and their meanings.
Example:
curl --help all
See also -v, --verbose.
--hostpubmd5 <md5>
(SFTP SCP) Pass a string containing 32 hexadecimal digits. The
string should be the 128 bit MD5 checksum of the remote host's
public key, curl will refuse the connection with the host unless
the md5sums match.
Example:
curl --hostpubmd5 e5c1c49020640a5ab0f2034854c321a8 sftp://example.com/
See also --hostpubsha256.
--hostpubsha256 <sha256>
(SFTP SCP) Pass a string containing a Base64-encoded SHA256 hash
of the remote host's public key. Curl will refuse the connection
with the host unless the hashes match.
Example:
curl --hostpubsha256 NDVkMTQxMGQ1ODdmMjQ3MjczYjAyOTY5MmRkMjVmNDQ= sftp://example.com/
See also --hostpubmd5. Added in 7.80.0.
--hsts <file name>
(HTTPS) This option enables HSTS for the transfer. If the file
name points to an existing HSTS cache file, that will be used.
After a completed transfer, the cache will be saved to the file
name again if it has been modified.
Specify a "" file name (zero length) to avoid loading/saving and
make curl just handle HSTS in memory.
If this option is used several times, curl will load contents
from all the files but the last one will be used for saving.
Example:
curl --hsts cache.txt https://example.com
See also --proto. Added in 7.74.0.
--http0.9
(HTTP) Tells curl to be fine with HTTP version 0.9 response.
HTTP/0.9 is a completely headerless response and therefore you
can also connect with this to non-HTTP servers and still get a
response since curl will simply transparently downgrade - if al‐
lowed.
Since curl 7.66.0, HTTP/0.9 is disabled by default.
Example:
curl --http0.9 https://example.com
See also --http1.1, --http2 and --http3. Added in 7.64.0.
-0, --http1.0
(HTTP) Tells curl to use HTTP version 1.0 instead of using its
internally preferred HTTP version.
Example:
curl --http1.0 https://example.com
See also --http0.9 and --http1.1. This option overrides
--http1.1 and --http2.
--http1.1
(HTTP) Tells curl to use HTTP version 1.1.
Example:
curl --http1.1 https://example.com
See also --http1.1 and --http0.9. This option overrides -0,
--http1.0 and --http2. Added in 7.33.0.
--http2-prior-knowledge
(HTTP) Tells curl to issue its non-TLS HTTP requests using
HTTP/2 without HTTP/1.1 Upgrade. It requires prior knowledge
that the server supports HTTP/2 straight away. HTTPS requests
will still do HTTP/2 the standard way with negotiated protocol
version in the TLS handshake.
Example:
curl --http2-prior-knowledge https://example.com
See also --http2 and --http3. --http2-prior-knowledge requires
that the underlying libcurl was built to support HTTP/2. This
option overrides --http1.1 and -0, --http1.0 and --http2. Added
in 7.49.0.
--http2
(HTTP) Tells curl to use HTTP version 2.
For HTTPS, this means curl will attempt to negotiate HTTP/2 in
the TLS handshake. curl does this by default.
For HTTP, this means curl will attempt to upgrade the request to
HTTP/2 using the Upgrade: request header.
Example:
curl --http2 https://example.com
See also --http1.1 and --http3. --http2 requires that the under‐
lying libcurl was built to support HTTP/2. This option overrides
--http1.1 and -0, --http1.0 and --http2-prior-knowledge. Added
in 7.33.0.
--http3
(HTTP) WARNING: this option is experimental. Do not use in pro‐
duction.
Tells curl to use HTTP version 3 directly to the host and port
number used in the URL. A normal HTTP/3 transaction will be done
to a host and then get redirected via Alt-Svc, but this option
allows a user to circumvent that when you know that the target
speaks HTTP/3 on the given host and port.
This option will make curl fail if a QUIC connection cannot be
established, it cannot fall back to a lower HTTP version on its
own.
Example:
curl --http3 https://example.com
See also --http1.1 and --http2. --http3 requires that the under‐
lying libcurl was built to support HTTP/3. This option overrides
--http1.1 and -0, --http1.0 and --http2 and --http2-prior-knowl‐
edge. Added in 7.66.0.
--ignore-content-length
(FTP HTTP) For HTTP, Ignore the Content-Length header. This is
particularly useful for servers running Apache 1.x, which will
report incorrect Content-Length for files larger than 2 giga‐
bytes.
For FTP (since 7.46.0), skip the RETR command to figure out the
size before downloading a file.
This option does not work for HTTP if libcurl was built to use
hyper.
Example:
curl --ignore-content-length https://example.com
See also --ftp-skip-pasv-ip.
-i, --include
Include the HTTP response headers in the output. The HTTP re‐
sponse headers can include things like server name, cookies,
date of the document, HTTP version and more...
To view the request headers, consider the -v, --verbose option.
Example:
curl -i https://example.com
See also -v, --verbose.
-k, --insecure
(TLS SFTP SCP) By default, every secure connection curl makes is
verified to be secure before the transfer takes place. This op‐
tion makes curl skip the verification step and proceed without
checking.
When this option is not used for protocols using TLS, curl veri‐
fies the server's TLS certificate before it continues: that the
certificate contains the right name which matches the host name
used in the URL and that the certificate has been signed by a CA
certificate present in the cert store. See this online resource
for further details:
https://curl.se/docs/sslcerts.html
For SFTP and SCP, this option makes curl skip the known_hosts
verification. known_hosts is a file normally stored in the
user's home directory in the .ssh subdirectory, which contains
host names and their public keys.
WARNING: using this option makes the transfer insecure.
Example:
curl --insecure https://example.com
See also --proxy-insecure, --cacert and --capath.
--interface <name>
Perform an operation using a specified interface. You can enter
interface name, IP address or host name. An example could look
like:
curl --interface eth0:1 https://www.example.com/
If this option is used several times, the last one will be used.
On Linux it can be used to specify a VRF, but the binary needs
to either have CAP_NET_RAW or to be run as root. More informa‐
tion about Linux VRF: https://www.kernel.org/doc/Documenta‐
tion/networking/vrf.txt
Example:
curl --interface eth0 https://example.com
See also --dns-interface.
-4, --ipv4
This option tells curl to resolve names to IPv4 addresses only,
and not for example try IPv6.
Example:
curl --ipv4 https://example.com
See also --http1.1 and --http2. This option overrides -6,
--ipv6.
-6, --ipv6
This option tells curl to resolve names to IPv6 addresses only,
and not for example try IPv4.
Example:
curl --ipv6 https://example.com
See also --http1.1 and --http2. This option overrides -4,
--ipv4.
-j, --junk-session-cookies
(HTTP) When curl is told to read cookies from a given file, this
option will make it discard all "session cookies". This will ba‐
sically have the same effect as if a new session is started.
Typical browsers always discard session cookies when they are
closed down.
Example:
curl --junk-session-cookies -b cookies.txt https://example.com
See also -b, --cookie and -c, --cookie-jar.
--keepalive-time <seconds>
This option sets the time a connection needs to remain idle be‐
fore sending keepalive probes and the time between individual
keepalive probes. It is currently effective on operating systems
offering the TCP_KEEPIDLE and TCP_KEEPINTVL socket options
(meaning Linux, recent AIX, HP-UX and more). This option has no
effect if --no-keepalive is used.
If this option is used several times, the last one will be used.
If unspecified, the option defaults to 60 seconds.
Example:
curl --keepalive-time 20 https://example.com
See also --no-keepalive and -m, --max-time.
--key-type <type>
(TLS) Private key file type. Specify which type your --key pro‐
vided private key is. DER, PEM, and ENG are supported. If not
specified, PEM is assumed.
If this option is used several times, the last one will be used.
Example:
curl --key-type DER --key here https://example.com
See also --key.
--key <key>
(TLS SSH) Private key file name. Allows you to provide your pri‐
vate key in this separate file. For SSH, if not specified, curl
tries the following candidates in order: '~/.ssh/id_rsa',
'~/.ssh/id_dsa', './id_rsa', './id_dsa'.
If curl is built against OpenSSL library, and the engine pkcs11
is available, then a PKCS#11 URI (RFC 7512) can be used to spec‐
ify a private key located in a PKCS#11 device. A string begin‐
ning with "pkcs11:" will be interpreted as a PKCS#11 URI. If a
PKCS#11 URI is provided, then the --engine option will be set as
"pkcs11" if none was provided and the --key-type option will be
set as "ENG" if none was provided.
If this option is used several times, the last one will be used.
Example:
curl --cert certificate --key here https://example.com
See also --key-type and -E, --cert.
--krb <level>
(FTP) Enable Kerberos authentication and use. The level must be
entered and should be one of 'clear', 'safe', 'confidential', or
'private'. Should you use a level that is not one of these,
'private' will instead be used.
If this option is used several times, the last one will be used.
Example:
curl --krb clear ftp://example.com/
See also --delegation and --ssl. --krb requires that the under‐
lying libcurl was built to support Kerberos.
--libcurl <file>
Append this option to any ordinary curl command line, and you
will get libcurl-using C source code written to the file that
does the equivalent of what your command-line operation does!
This option is global and does not need to be specified for each
use of -:, --next.
If this option is used several times, the last given file name
will be used.
Example:
curl --libcurl client.c https://example.com
See also -v, --verbose.
--limit-rate <speed>
Specify the maximum transfer rate you want curl to use - for
both downloads and uploads. This feature is useful if you have a
limited pipe and you would like your transfer not to use your
entire bandwidth. To make it slower than it otherwise would be.
The given speed is measured in bytes/second, unless a suffix is
appended. Appending 'k' or 'K' will count the number as kilo‐
bytes, 'm' or 'M' makes it megabytes, while 'g' or 'G' makes it
gigabytes. The suffixes (k, M, G, T, P) are 1024 based. For ex‐
ample 1k is 1024. Examples: 200K, 3m and 1G.
The rate limiting logic works on averaging the transfer speed to
no more than the set threshold over a period of multiple sec‐
onds.
If you also use the -Y, --speed-limit option, that option will
take precedence and might cripple the rate-limiting slightly, to
help keeping the speed-limit logic working.
If this option is used several times, the last one will be used.
Examples:
curl --limit-rate 100K https://example.com
curl --limit-rate 1000 https://example.com
curl --limit-rate 10M https://example.com
See also -Y, --speed-limit and -y, --speed-time.
-l, --list-only
(FTP POP3) (FTP) When listing an FTP directory, this switch
forces a name-only view. This is especially useful if the user
wants to machine-parse the contents of an FTP directory since
the normal directory view does not use a standard look or for‐
mat. When used like this, the option causes an NLST command to
be sent to the server instead of LIST.
Note: Some FTP servers list only files in their response to
NLST; they do not include sub-directories and symbolic links.
(POP3) When retrieving a specific email from POP3, this switch
forces a LIST command to be performed instead of RETR. This is
particularly useful if the user wants to see if a specific mes‐
sage-id exists on the server and what size it is.
Note: When combined with -X, --request, this option can be used
to send a UIDL command instead, so the user may use the email's
unique identifier rather than its message-id to make the re‐
quest.
Example:
curl --list-only ftp://example.com/dir/
See also -Q, --quote and -X, --request.
--local-port <num/range>
Set a preferred single number or range (FROM-TO) of local port
numbers to use for the connection(s). Note that port numbers by
nature are a scarce resource that will be busy at times so set‐
ting this range to something too narrow might cause unnecessary
connection setup failures.
Example:
curl --local-port 1000-3000 https://example.com
See also -g, --globoff.
--location-trusted
(HTTP) Like -L, --location, but will allow sending the name +
password to all hosts that the site may redirect to. This may or
may not introduce a security breach if the site redirects you to
a site to which you will send your authentication info (which is
plaintext in the case of HTTP Basic authentication).
Example:
curl --location-trusted -u user:password https://example.com
See also -u, --user.
-L, --location
(HTTP) If the server reports that the requested page has moved
to a different location (indicated with a Location: header and a
3XX response code), this option will make curl redo the request
on the new place. If used together with -i, --include or -I,
--head, headers from all requested pages will be shown. When au‐
thentication is used, curl only sends its credentials to the
initial host. If a redirect takes curl to a different host, it
will not be able to intercept the user+password. See also --lo‐
cation-trusted on how to change this. You can limit the amount
of redirects to follow by using the --max-redirs option.
When curl follows a redirect and if the request is a POST, it
will send the following request with a GET if the HTTP response
was 301, 302, or 303. If the response code was any other 3xx
code, curl will re-send the following request using the same un‐
modified method.
You can tell curl to not change POST requests to GET after a 30x
response by using the dedicated options for that: --post301,
--post302 and --post303.
The method set with -X, --request overrides the method curl
would otherwise select to use.
Example:
curl -L https://example.com
See also --resolve and --alt-svc.
--login-options <options>
(IMAP POP3 SMTP) Specify the login options to use during server
authentication.
You can use login options to specify protocol specific options
that may be used during authentication. At present only IMAP,
POP3 and SMTP support login options. For more information about
login options please see RFC 2384, RFC 5092 and IETF draft
draft-earhart-url-smtp-00.txt
If this option is used several times, the last one will be used.
Example:
curl --login-options 'AUTH=*' imap://example.com
See also -u, --user. Added in 7.34.0.
--mail-auth <address>
(SMTP) Specify a single address. This will be used to specify
the authentication address (identity) of a submitted message
that is being relayed to another server.
Example:
curl --mail-auth user@example.come -T mail smtp://example.com/
See also --mail-rcpt and --mail-from.
--mail-from <address>
(SMTP) Specify a single address that the given mail should get
sent from.
Example:
curl --mail-from user@example.com -T mail smtp://example.com/
See also --mail-rcpt and --mail-auth.
--mail-rcpt-allowfails
(SMTP) When sending data to multiple recipients, by default curl
will abort SMTP conversation if at least one of the recipients
causes RCPT TO command to return an error.
The default behavior can be changed by passing --mail-rcpt-al‐
lowfails command-line option which will make curl ignore errors
and proceed with the remaining valid recipients.
If all recipients trigger RCPT TO failures and this flag is
specified, curl will still abort the SMTP conversation and re‐
turn the error received from to the last RCPT TO command.
Example:
curl --mail-rcpt-allowfails --mail-rcpt dest@example.com smtp://example.com
See also --mail-rcpt. Added in 7.69.0.
--mail-rcpt <address>
(SMTP) Specify a single email address, user name or mailing list
name. Repeat this option several times to send to multiple re‐
cipients.
When performing an address verification (VRFY command), the re‐
cipient should be specified as the user name or user name and
domain (as per Section 3.5 of RFC5321). (Added in 7.34.0)
When performing a mailing list expand (EXPN command), the recip‐
ient should be specified using the mailing list name, such as
"Friends" or "London-Office". (Added in 7.34.0)
Example:
curl --mail-rcpt user@example.net smtp://example.com
See also --mail-rcpt-allowfails.
-M, --manual
Manual. Display the huge help text.
Example:
curl --manual
See also -v, --verbose, --libcurl and --trace.
--max-filesize <bytes>
(FTP HTTP MQTT) Specify the maximum size (in bytes) of a file to
download. If the file requested is larger than this value, the
transfer will not start and curl will return with exit code 63.
A size modifier may be used. For example, Appending 'k' or 'K'
will count the number as kilobytes, 'm' or 'M' makes it
megabytes, while 'g' or 'G' makes it gigabytes. Examples: 200K,
3m and 1G. (Added in 7.58.0)
NOTE: The file size is not always known prior to download, and
for such files this option has no effect even if the file trans‐
fer ends up being larger than this given limit. Example:
curl --max-filesize 100K https://example.com
See also --limit-rate.
--max-redirs <num>
(HTTP) Set maximum number of redirections to follow. When -L,
--location is used, to prevent curl from following too many
redirects, by default, the limit is set to 50 redirects. Set
this option to -1 to make it unlimited.
If this option is used several times, the last one will be used.
Example:
curl --max-redirs 3 --location https://example.com
See also -L, --location.
-m, --max-time <fractional seconds>
Maximum time in seconds that you allow the whole operation to
take. This is useful for preventing your batch jobs from hang‐
ing for hours due to slow networks or links going down. Since
7.32.0, this option accepts decimal values, but the actual time‐
out will decrease in accuracy as the specified timeout increases
in decimal precision.
If this option is used several times, the last one will be used.
Examples:
curl --max-time 10 https://example.com
curl --max-time 2.92 https://example.com
See also --connect-timeout.
--metalink
This option was previously used to specify a metalink resource.
Metalink support has been disabled in curl since 7.78.0 for se‐
curity reasons.
Example:
curl --metalink file https://example.com
See also -Z, --parallel.
--negotiate
(HTTP) Enables Negotiate (SPNEGO) authentication.
This option requires a library built with GSS-API or SSPI sup‐
port. Use -V, --version to see if your curl supports GSS-
API/SSPI or SPNEGO.
When using this option, you must also provide a fake -u, --user
option to activate the authentication code properly. Sending a
'-u :' is enough as the user name and password from the -u,
--user option are not actually used.
If this option is used several times, only the first one is
used.
Example:
curl --negotiate -u : https://example.com
See also --basic, --ntlm, --anyauth and --proxy-negotiate.
--netrc-file <filename>
This option is similar to -n, --netrc, except that you provide
the path (absolute or relative) to the netrc file that curl
should use. You can only specify one netrc file per invocation.
If several --netrc-file options are provided, the last one will
be used.
It will abide by --netrc-optional if specified.
Example:
curl --netrc-file netrc https://example.com
See also -n, --netrc, -u, --user and -K, --config. This option
overrides -n, --netrc.
--netrc-optional
Similar to -n, --netrc, but this option makes the .netrc usage
optional and not mandatory as the -n, --netrc option does.
Example:
curl --netrc-optional https://example.com
See also --netrc-file. This option overrides -n, --netrc.
-n, --netrc
Makes curl scan the .netrc (_netrc on Windows) file in the
user's home directory for login name and password. This is typi‐
cally used for FTP on Unix. If used with HTTP, curl will enable
user authentication. See netrc(5) and ftp(1) for details on the
file format. Curl will not complain if that file does not have
the right permissions (it should be neither world- nor group-
readable). The environment variable "HOME" is used to find the
home directory.
A quick and simple example of how to setup a .netrc to allow
curl to FTP to the machine host.domain.com with user name 'my‐
self' and password 'secret' could look similar to:
machine host.domain.com
login myself
password secret"
Example:
curl --netrc https://example.com
See also --netrc-file, -K, --config and -u, --user.
-:, --next
Tells curl to use a separate operation for the following URL and
associated options. This allows you to send several URL re‐
quests, each with their own specific options, for example, such
as different user names or custom requests for each.
-:, --next will reset all local options and only global ones
will have their values survive over to the operation following
the -:, --next instruction. Global options include -v, --ver‐
bose, --trace, --trace-ascii and --fail-early.
For example, you can do both a GET and a POST in a single com‐
mand line:
curl www1.example.com --next -d postthis www2.example.com
Examples:
curl https://example.com --next -d postthis www2.example.com
curl -I https://example.com --next https://example.net/
See also -Z, --parallel and -K, --config. Added in 7.36.0.
--no-alpn
(HTTPS) Disable the ALPN TLS extension. ALPN is enabled by de‐
fault if libcurl was built with an SSL library that supports
ALPN. ALPN is used by a libcurl that supports HTTP/2 to negoti‐
ate HTTP/2 support with the server during https sessions.
Example:
curl --no-alpn https://example.com
See also --no-npn and --http2. --no-alpn requires that the un‐
derlying libcurl was built to support TLS. Added in 7.36.0.
-N, --no-buffer
Disables the buffering of the output stream. In normal work sit‐
uations, curl will use a standard buffered output stream that
will have the effect that it will output the data in chunks, not
necessarily exactly when the data arrives. Using this option
will disable that buffering.
Note that this is the negated option name documented. You can
thus use --buffer to enforce the buffering.
Example:
curl --no-buffer https://example.com
See also -#, --progress-bar.
--no-keepalive
Disables the use of keepalive messages on the TCP connection.
curl otherwise enables them by default.
Note that this is the negated option name documented. You can
thus use --keepalive to enforce keepalive.
Example:
curl --no-keepalive https://example.com
See also --keepalive-time.
--no-npn
(HTTPS) Disable the NPN TLS extension. NPN is enabled by default
if libcurl was built with an SSL library that supports NPN. NPN
is used by a libcurl that supports HTTP/2 to negotiate HTTP/2
support with the server during https sessions.
Example:
curl --no-npn https://example.com
See also --no-alpn and --http2. --no-npn requires that the un‐
derlying libcurl was built to support TLS. Added in 7.36.0.
--no-progress-meter
Option to switch off the progress meter output without muting or
otherwise affecting warning and informational messages like -s,
--silent does.
Note that this is the negated option name documented. You can
thus use --progress-meter to enable the progress meter again.
Example:
curl --no-progress-meter -o store https://example.com
See also -v, --verbose and -s, --silent. Added in 7.67.0.
--no-sessionid
(TLS) Disable curl's use of SSL session-ID caching. By default
all transfers are done using the cache. Note that while nothing
should ever get hurt by attempting to reuse SSL session-IDs,
there seem to be broken SSL implementations in the wild that may
require you to disable this in order for you to succeed.
Note that this is the negated option name documented. You can
thus use --sessionid to enforce session-ID caching.
Example:
curl --no-sessionid https://example.com
See also -k, --insecure.
--noproxy <no-proxy-list>
Comma-separated list of hosts for which not to use a proxy, if
one is specified. The only wildcard is a single * character,
which matches all hosts, and effectively disables the proxy.
Each name in this list is matched as either a domain which con‐
tains the hostname, or the hostname itself. For example, lo‐
cal.com would match local.com, local.com:80, and www.local.com,
but not www.notlocal.com.
Since 7.53.0, This option overrides the environment variables
that disable the proxy ('no_proxy' and 'NO_PROXY'). If there's
an environment variable disabling a proxy, you can set the no‐
proxy list to "" to override it.
Example:
curl --noproxy "www.example" https://example.com
See also -x, --proxy.
--ntlm-wb
(HTTP) Enables NTLM much in the style --ntlm does, but hand over
the authentication to the separate binary ntlmauth application
that is executed when needed.
Example:
curl --ntlm-wb -u user:password https://example.com
See also --ntlm and --proxy-ntlm.
--ntlm (HTTP) Enables NTLM authentication. The NTLM authentication
method was designed by Microsoft and is used by IIS web servers.
It is a proprietary protocol, reverse-engineered by clever peo‐
ple and implemented in curl based on their efforts. This kind of
behavior should not be endorsed, you should encourage everyone
who uses NTLM to switch to a public and documented authentica‐
tion method instead, such as Digest.
If you want to enable NTLM for your proxy authentication, then
use --proxy-ntlm.
If this option is used several times, only the first one is
used.
Example:
curl --ntlm -u user:password https://example.com
See also --proxy-ntlm. --ntlm requires that the underlying
libcurl was built to support TLS. This option overrides --basic
and --negotiate and --digest and --anyauth.
--oauth2-bearer <token>
(IMAP POP3 SMTP HTTP) Specify the Bearer Token for OAUTH 2.0
server authentication. The Bearer Token is used in conjunction
with the user name which can be specified as part of the --url
or -u, --user options.
The Bearer Token and user name are formatted according to RFC
6750.
If this option is used several times, the last one will be used.
Example:
curl --oauth2-bearer "mF_9.B5f-4.1JqM" https://example.com
See also --basic, --ntlm and --digest. Added in 7.33.0.
--output-dir <dir>
This option specifies the directory in which files should be
stored, when -O, --remote-name or -o, --output are used.
The given output directory is used for all URLs and output op‐
tions on the command line, up until the first -:, --next.
If the specified target directory does not exist, the operation
will fail unless --create-dirs is also used.
If this option is used multiple times, the last specified direc‐
tory will be used.
Example:
curl --output-dir "tmp" -O https://example.com
See also -O, --remote-name and -J, --remote-header-name. Added
in 7.73.0.
-o, --output <file>
Write output to <file> instead of stdout. If you are using {} or
[] to fetch multiple documents, you should quote the URL and you
can use '#' followed by a number in the <file> specifier. That
variable will be replaced with the current string for the URL
being fetched. Like in:
curl "http://{one,two}.example.com" -o "file_#1.txt"
or use several variables like:
curl "http://{site,host}.host[1-5].com" -o "#1_#2"
You may use this option as many times as the number of URLs you
have. For example, if you specify two URLs on the same command
line, you can use it like this:
curl -o aa example.com -o bb example.net
and the order of the -o options and the URLs does not matter,
just that the first -o is for the first URL and so on, so the
above command line can also be written as
curl example.com example.net -o aa -o bb
See also the --create-dirs option to create the local directo‐
ries dynamically. Specifying the output as '-' (a single dash)
will force the output to be done to stdout.
To suppress response bodies, you can redirect output to
/dev/null:
curl example.com -o /dev/null
Or for Windows use nul:
curl example.com -o nul
Examples:
curl -o file https://example.com
curl "http://{one,two}.example.com" -o "file_#1.txt"
curl "http://{site,host}.host[1-5].com" -o "#1_#2"
curl -o file https://example.com -o file2 https://example.net
See also -O, --remote-name, --remote-name-all and -J, --remote-
header-name.
--parallel-immediate
When doing parallel transfers, this option will instruct curl
that it should rather prefer opening up more connections in par‐
allel at once rather than waiting to see if new transfers can be
added as multiplexed streams on another connection.
This option is global and does not need to be specified for each
use of -:, --next.
Example:
curl --parallel-immediate -Z https://example.com -o file1 https://example.com -o file2
See also -Z, --parallel and --parallel-max. Added in 7.68.0.
--parallel-max <num>
When asked to do parallel transfers, using -Z, --parallel, this
option controls the maximum amount of transfers to do simultane‐
ously.
This option is global and does not need to be specified for each
use of -:, --next.
The default is 50.
Example:
curl --parallel-max 100 -Z https://example.com ftp://example.com/
See also -Z, --parallel. Added in 7.66.0.
-Z, --parallel
Makes curl perform its transfers in parallel as compared to the
regular serial manner.
This option is global and does not need to be specified for each
use of -:, --next.
Example:
curl --parallel https://example.com -o file1 https://example.com -o file2
See also -:, --next and -v, --verbose. Added in 7.66.0.
--pass <phrase>
(SSH TLS) Passphrase for the private key.
If this option is used several times, the last one will be used.
Example:
curl --pass secret --key file https://example.com
See also --key and -u, --user.
--path-as-is
Tell curl to not handle sequences of /../ or /./ in the given
URL path. Normally curl will squash or merge them according to
standards but with this option set you tell it not to do that.
Example:
curl --path-as-is https://example.com/../../etc/passwd
See also --request-target. Added in 7.42.0.
--pinnedpubkey <hashes>
(TLS) Tells curl to use the specified public key file (or
hashes) to verify the peer. This can be a path to a file which
contains a single public key in PEM or DER format, or any number
of base64 encoded sha256 hashes preceded by 'sha256//' and sepa‐
rated by ';'.
When negotiating a TLS or SSL connection, the server sends a
certificate indicating its identity. A public key is extracted
from this certificate and if it does not exactly match the pub‐
lic key provided to this option, curl will abort the connection
before sending or receiving any data.
PEM/DER support:
7.39.0: OpenSSL, GnuTLS and GSKit
7.43.0: NSS and wolfSSL
7.47.0: mbedtls
sha256 support:
7.44.0: OpenSSL, GnuTLS, NSS and wolfSSL
7.47.0: mbedtls
Other SSL backends not supported.
If this option is used several times, the last one will be used.
Examples:
curl --pinnedpubkey keyfile https://example.com
curl --pinnedpubkey 'sha256//ce118b51897f4452dc' https://example.com
See also --hostpubsha256. Added in 7.39.0.
--post301
(HTTP) Tells curl to respect RFC 7231/6.4.2 and not convert POST
requests into GET requests when following a 301 redirection. The
non-RFC behavior is ubiquitous in web browsers, so curl does the
conversion by default to maintain consistency. However, a server
may require a POST to remain a POST after such a redirection.
This option is meaningful only when using -L, --location.
Example:
curl --post301 --location -d "data" https://example.com
See also --post302, --post303 and -L, --location.
--post302
(HTTP) Tells curl to respect RFC 7231/6.4.3 and not convert POST
requests into GET requests when following a 302 redirection. The
non-RFC behavior is ubiquitous in web browsers, so curl does the
conversion by default to maintain consistency. However, a server
may require a POST to remain a POST after such a redirection.
This option is meaningful only when using -L, --location.
Example:
curl --post302 --location -d "data" https://example.com
See also --post301, --post303 and -L, --location.
--post303
(HTTP) Tells curl to violate RFC 7231/6.4.4 and not convert POST
requests into GET requests when following 303 redirections. A
server may require a POST to remain a POST after a 303 redirect‐
ion. This option is meaningful only when using -L, --location.
Example:
curl --post303 --location -d "data" https://example.com
See also --post302, --post301 and -L, --location.
--preproxy [protocol://]host[:port]
Use the specified SOCKS proxy before connecting to an HTTP or
HTTPS -x, --proxy. In such a case curl first connects to the
SOCKS proxy and then connects (through SOCKS) to the HTTP or
HTTPS proxy. Hence pre proxy.
The pre proxy string should be specified with a protocol:// pre‐
fix to specify alternative proxy protocols. Use socks4://,
socks4a://, socks5:// or socks5h:// to request the specific
SOCKS version to be used. No protocol specified will make curl
default to SOCKS4.
If the port number is not specified in the proxy string, it is
assumed to be 1080.
User and password that might be provided in the proxy string are
URL decoded by curl. This allows you to pass in special charac‐
ters such as @ by using %40 or pass in a colon with %3a.
If this option is used several times, the last one will be used.
Example:
curl --preproxy socks5://proxy.example -x http://http.example https://example.com
See also -x, --proxy and --socks5. Added in 7.52.0.
-#, --progress-bar
Make curl display transfer progress as a simple progress bar in‐
stead of the standard, more informational, meter.
This progress bar draws a single line of '#' characters across
the screen and shows a percentage if the transfer size is known.
For transfers without a known size, there will be space ship
(-=o=-) that moves back and forth but only while data is being
transferred, with a set of flying hash sign symbols on top.
This option is global and does not need to be specified for each
use of -:, --next.
Example:
curl -# -O https://example.com
See also --styled-output.
--proto-default <protocol>
Tells curl to use protocol for any URL missing a scheme name.
An unknown or unsupported protocol causes error CURLE_UNSUP‐
PORTED_PROTOCOL (1).
This option does not change the default proxy protocol (http).
Without this option set, curl guesses protocol based on the host
name, see --url for details.
Example:
curl --proto-default https ftp.example.com
See also --proto and --proto-redir. Added in 7.45.0.
--proto-redir <protocols>
Tells curl to limit what protocols it may use on redirect. Pro‐
tocols denied by --proto are not overridden by this option. See
--proto for how protocols are represented.
Example, allow only HTTP and HTTPS on redirect:
curl --proto-redir -all,http,https http://example.com
By default curl will only allow HTTP, HTTPS, FTP and FTPS on re‐
direct (since 7.65.2). Specifying all or +all enables all proto‐
cols on redirects, which is not good for security.
Example:
curl --proto-redir =http,https https://example.com
See also --proto.
--proto <protocols>
Tells curl to limit what protocols it may use for transfers.
Protocols are evaluated left to right, are comma separated, and
are each a protocol name or 'all', optionally prefixed by zero
or more modifiers. Available modifiers are:
+ Permit this protocol in addition to protocols already permit‐
ted (this is the default if no modifier is used).
- Deny this protocol, removing it from the list of protocols
already permitted.
= Permit only this protocol (ignoring the list already permit‐
ted), though subject to later modification by subsequent en‐
tries in the comma separated list.
For example:
--proto -ftps uses the default protocols, but disables ftps
--proto -all,https,+http
only enables http and https
--proto =http,https
also only enables http and https
Unknown protocols produce a warning. This allows scripts to
safely rely on being able to disable potentially dangerous pro‐
tocols, without relying upon support for that protocol being
built into curl to avoid an error.
This option can be used multiple times, in which case the effect
is the same as concatenating the protocols into one instance of
the option.
Example:
curl --proto =http,https,sftp https://example.com
See also --proto-redir and --proto-default.
--proxy-anyauth
Tells curl to pick a suitable authentication method when commu‐
nicating with the given HTTP proxy. This might cause an extra
request/response round-trip.
Example:
curl --proxy-anyauth --proxy-user user:passwd -x proxy https://example.com
See also -x, --proxy, --proxy-basic and --proxy-digest.
--proxy-basic
Tells curl to use HTTP Basic authentication when communicating
with the given proxy. Use --basic for enabling HTTP Basic with a
remote host. Basic is the default authentication method curl
uses with proxies.
Example:
curl --proxy-basic --proxy-user user:passwd -x proxy https://example.com
See also -x, --proxy, --proxy-anyauth and --proxy-digest.
--proxy-cacert <file>
Same as --cacert but used in HTTPS proxy context.
Example:
curl --proxy-cacert CA-file.txt -x https://proxy https://example.com
See also --proxy-capath, --cacert, --capath and -x, --proxy.
Added in 7.52.0.
--proxy-capath <dir>
Same as --capath but used in HTTPS proxy context.
Example:
curl --proxy-capath /local/directory -x https://proxy https://example.com
See also --proxy-cacert, -x, --proxy and --capath. Added in
7.52.0.
--proxy-cert-type <type>
Same as --cert-type but used in HTTPS proxy context.
Example:
curl --proxy-cert-type PEM --proxy-cert file -x https://proxy https://example.com
See also --proxy-cert. Added in 7.52.0.
--proxy-cert <cert[:passwd]>
Same as -E, --cert but used in HTTPS proxy context.
Example:
curl --proxy-cert file -x https://proxy https://example.com
See also --proxy-cert-type. Added in 7.52.0.
--proxy-ciphers <list>
Same as --ciphers but used in HTTPS proxy context.
Example:
curl --proxy-ciphers ECDHE-ECDSA-AES256-CCM8 -x https://proxy https://example.com
See also --ciphers, --curves and -x, --proxy. Added in 7.52.0.
--proxy-crlfile <file>
Same as --crlfile but used in HTTPS proxy context.
Example:
curl --proxy-crlfile rejects.txt -x https://proxy https://example.com
See also --crlfile and -x, --proxy. Added in 7.52.0.
--proxy-digest
Tells curl to use HTTP Digest authentication when communicating
with the given proxy. Use --digest for enabling HTTP Digest with
a remote host.
Example:
curl --proxy-digest --proxy-user user:passwd -x proxy https://example.com
See also -x, --proxy, --proxy-anyauth and --proxy-basic.
--proxy-header <header/@file>
(HTTP) Extra header to include in the request when sending HTTP
to a proxy. You may specify any number of extra headers. This is
the equivalent option to -H, --header but is for proxy communi‐
cation only like in CONNECT requests when you want a separate
header sent to the proxy to what is sent to the actual remote
host.
curl will make sure that each header you add/replace is sent
with the proper end-of-line marker, you should thus not add that
as a part of the header content: do not add newlines or carriage
returns, they will only mess things up for you.
Headers specified with this option will not be included in re‐
quests that curl knows will not be sent to a proxy.
Starting in 7.55.0, this option can take an argument in @file‐
name style, which then adds a header for each line in the input
file. Using @- will make curl read the header file from stdin.
This option can be used multiple times to add/replace/remove
multiple headers.
Examples:
curl --proxy-header "X-First-Name: Joe" -x http://proxy https://example.com
curl --proxy-header "User-Agent: surprise" -x http://proxy https://example.com
curl --proxy-header "Host:" -x http://proxy https://example.com
See also -x, --proxy. Added in 7.37.0.
--proxy-insecure
Same as -k, --insecure but used in HTTPS proxy context.
Example:
curl --proxy-insecure -x https://proxy https://example.com
See also -x, --proxy and -k, --insecure. Added in 7.52.0.
--proxy-key-type <type>
Same as --key-type but used in HTTPS proxy context.
Example:
curl --proxy-key-type DER --proxy-key here -x https://proxy https://example.com
See also --proxy-key and -x, --proxy. Added in 7.52.0.
--proxy-key <key>
Same as --key but used in HTTPS proxy context.
Example:
curl --proxy-key here -x https://proxy https://example.com
See also --proxy-key-type and -x, --proxy. Added in 7.52.0.
--proxy-negotiate
Tells curl to use HTTP Negotiate (SPNEGO) authentication when
communicating with the given proxy. Use --negotiate for enabling
HTTP Negotiate (SPNEGO) with a remote host.
Example:
curl --proxy-negotiate --proxy-user user:passwd -x proxy https://example.com
See also --proxy-anyauth and --proxy-basic.
--proxy-ntlm
Tells curl to use HTTP NTLM authentication when communicating
with the given proxy. Use --ntlm for enabling NTLM with a remote
host.
Example:
curl --proxy-ntlm --proxy-user user:passwd -x http://proxy https://example.com
See also --proxy-negotiate and --proxy-anyauth.
--proxy-pass <phrase>
Same as --pass but used in HTTPS proxy context.
Example:
curl --proxy-pass secret --proxy-key here -x https://proxy https://example.com
See also -x, --proxy and --proxy-key. Added in 7.52.0.
--proxy-pinnedpubkey <hashes>
(TLS) Tells curl to use the specified public key file (or
hashes) to verify the proxy. This can be a path to a file which
contains a single public key in PEM or DER format, or any number
of base64 encoded sha256 hashes preceded by 'sha256//' and sepa‐
rated by ';'.
When negotiating a TLS or SSL connection, the server sends a
certificate indicating its identity. A public key is extracted
from this certificate and if it does not exactly match the pub‐
lic key provided to this option, curl will abort the connection
before sending or receiving any data.
If this option is used several times, the last one will be used.
Examples:
curl --proxy-pinnedpubkey keyfile https://example.com
curl --proxy-pinnedpubkey 'sha256//ce118b51897f4452dc' https://example.com
See also --pinnedpubkey and -x, --proxy. Added in 7.59.0.
--proxy-service-name <name>
This option allows you to change the service name for proxy ne‐
gotiation.
Example:
curl --proxy-service-name "shrubbery" -x proxy https://example.com
See also --service-name and -x, --proxy. Added in 7.43.0.
--proxy-ssl-allow-beast
Same as --ssl-allow-beast but used in HTTPS proxy context.
Example:
curl --proxy-ssl-allow-beast -x https://proxy https://example.com
See also --ssl-allow-beast and -x, --proxy. Added in 7.52.0.
--proxy-ssl-auto-client-cert
Same as --ssl-auto-client-cert but used in HTTPS proxy context.
Example:
curl --proxy-ssl-auto-client-cert -x https://proxy https://example.com
See also --ssl-auto-client-cert and -x, --proxy. Added in
7.77.0.
--proxy-tls13-ciphers <ciphersuite list>
(TLS) Specifies which cipher suites to use in the connection to
your HTTPS proxy when it negotiates TLS 1.3. The list of ciphers
suites must specify valid ciphers. Read up on TLS 1.3 cipher
suite details on this URL:
https://curl.se/docs/ssl-ciphers.html
This option is currently used only when curl is built to use
OpenSSL 1.1.1 or later. If you are using a different SSL backend
you can try setting TLS 1.3 cipher suites by using the --proxy-
ciphers option.
If this option is used several times, the last one will be used.
Example:
curl --proxy-tls13-ciphers TLS_AES_128_GCM_SHA256 -x proxy https://example.com
See also --tls13-ciphers and --curves. Added in 7.61.0.
--proxy-tlsauthtype <type>
Same as --tlsauthtype but used in HTTPS proxy context.
Example:
curl --proxy-tlsauthtype SRP -x https://proxy https://example.com
See also -x, --proxy and --proxy-tlsuser. Added in 7.52.0.
--proxy-tlspassword <string>
Same as --tlspassword but used in HTTPS proxy context.
Example:
curl --proxy-tlspassword passwd -x https://proxy https://example.com
See also -x, --proxy and --proxy-tlsuser. Added in 7.52.0.
--proxy-tlsuser <name>
Same as --tlsuser but used in HTTPS proxy context.
Example:
curl --proxy-tlsuser smith -x https://proxy https://example.com
See also -x, --proxy and --proxy-tlspassword. Added in 7.52.0.
--proxy-tlsv1
Same as -1, --tlsv1 but used in HTTPS proxy context.
Example:
curl --proxy-tlsv1 -x https://proxy https://example.com
See also -x, --proxy. Added in 7.52.0.
-U, --proxy-user <user:password>
Specify the user name and password to use for proxy authentica‐
tion.
If you use a Windows SSPI-enabled curl binary and do either Ne‐
gotiate or NTLM authentication then you can tell curl to select
the user name and password from your environment by specifying a
single colon with this option: "-U :".
On systems where it works, curl will hide the given option argu‐
ment from process listings. This is not enough to protect cre‐
dentials from possibly getting seen by other users on the same
system as they will still be visible for a moment before
cleared. Such sensitive data should be retrieved from a file in‐
stead or similar and never used in clear text in a command line.
If this option is used several times, the last one will be used.
Example:
curl --proxy-user name:pwd -x proxy https://example.com
See also --proxy-pass.
-x, --proxy [protocol://]host[:port]
Use the specified proxy.
The proxy string can be specified with a protocol:// prefix. No
protocol specified or http:// will be treated as HTTP proxy. Use
socks4://, socks4a://, socks5:// or socks5h:// to request a spe‐
cific SOCKS version to be used.
HTTPS proxy support via https:// protocol prefix was added in
7.52.0 for OpenSSL, GnuTLS and NSS.
Unrecognized and unsupported proxy protocols cause an error
since 7.52.0. Prior versions may ignore the protocol and use
http:// instead.
If the port number is not specified in the proxy string, it is
assumed to be 1080.
This option overrides existing environment variables that set
the proxy to use. If there's an environment variable setting a
proxy, you can set proxy to "" to override it.
All operations that are performed over an HTTP proxy will trans‐
parently be converted to HTTP. It means that certain protocol
specific operations might not be available. This is not the case
if you can tunnel through the proxy, as one with the -p, --prox‐
ytunnel option.
User and password that might be provided in the proxy string are
URL decoded by curl. This allows you to pass in special charac‐
ters such as @ by using %40 or pass in a colon with %3a.
The proxy host can be specified the same way as the proxy envi‐
ronment variables, including the protocol prefix (http://) and
the embedded user + password.
If this option is used several times, the last one will be used.
Example:
curl --proxy http://proxy.example https://example.com
See also --socks5 and --proxy-basic.
--proxy1.0 <host[:port]>
Use the specified HTTP 1.0 proxy. If the port number is not
specified, it is assumed at port 1080.
The only difference between this and the HTTP proxy option -x,
--proxy, is that attempts to use CONNECT through the proxy will
specify an HTTP 1.0 protocol instead of the default HTTP 1.1.
Example:
curl --proxy1.0 -x http://proxy https://example.com
See also -x, --proxy, --socks5 and --preproxy.
-p, --proxytunnel
When an HTTP proxy is used -x, --proxy, this option will make
curl tunnel through the proxy. The tunnel approach is made with
the HTTP proxy CONNECT request and requires that the proxy al‐
lows direct connect to the remote port number curl wants to tun‐
nel through to.
To suppress proxy CONNECT response headers when curl is set to
output headers use --suppress-connect-headers.
Example:
curl --proxytunnel -x http://proxy https://example.com
See also -x, --proxy.
--pubkey <key>
(SFTP SCP) Public key file name. Allows you to provide your pub‐
lic key in this separate file.
If this option is used several times, the last one will be used.
(As of 7.39.0, curl attempts to automatically extract the public
key from the private key file, so passing this option is gener‐
ally not required. Note that this public key extraction requires
libcurl to be linked against a copy of libssh2 1.2.8 or higher
that is itself linked against OpenSSL.)
Example:
curl --pubkey file.pub sftp://example.com/
See also --pass.
-Q, --quote <command>
(FTP SFTP) Send an arbitrary command to the remote FTP or SFTP
server. Quote commands are sent BEFORE the transfer takes place
(just after the initial PWD command in an FTP transfer, to be
exact). To make commands take place after a successful transfer,
prefix them with a dash '-'. To make commands be sent after curl
has changed the working directory, just before the transfer com‐
mand(s), prefix the command with a '+' (this is only supported
for FTP). You may specify any number of commands.
By default curl will stop at first failure. To make curl con‐
tinue even if the command fails, prefix the command with an as‐
terisk (*). Otherwise, if the server returns failure for one of
the commands, the entire operation will be aborted.
You must send syntactically correct FTP commands as RFC 959 de‐
fines to FTP servers, or one of the commands listed below to
SFTP servers.
This option can be used multiple times.
SFTP is a binary protocol. Unlike for FTP, curl interprets SFTP
quote commands itself before sending them to the server. File
names may be quoted shell-style to embed spaces or special char‐
acters. Following is the list of all supported SFTP quote com‐
mands:
atime date file
The atime command sets the last access time of the file
named by the file operand. The <date expression> can be
all sorts of date strings, see the curl_getdate(3) man
page for date expression details. (Added in 7.73.0)
chgrp group file
The chgrp command sets the group ID of the file named by
the file operand to the group ID specified by the group
operand. The group operand is a decimal integer group ID.
chmod mode file
The chmod command modifies the file mode bits of the
specified file. The mode operand is an octal integer mode
number.
chown user file
The chown command sets the owner of the file named by the
file operand to the user ID specified by the user oper‐
and. The user operand is a decimal integer user ID.
ln source_file target_file
The ln and symlink commands create a symbolic link at the
target_file location pointing to the source_file loca‐
tion.
mkdir directory_name
The mkdir command creates the directory named by the di‐
rectory_name operand.
mtime date file
The mtime command sets the last modification time of the
file named by the file operand. The <date expression> can
be all sorts of date strings, see the curl_getdate(3) man
page for date expression details. (Added in 7.73.0)
pwd The pwd command returns the absolute pathname of the cur‐
rent working directory.
rename source target
The rename command renames the file or directory named by
the source operand to the destination path named by the
target operand.
rm file
The rm command removes the file specified by the file op‐
erand.
rmdir directory
The rmdir command removes the directory entry specified
by the directory operand, provided it is empty.
symlink source_file target_file
See ln.
Example:
curl --quote "DELE file" ftp://example.com/foo
See also -X, --request.
--random-file <file>
Specify the path name to file containing what will be considered
as random data. The data may be used to seed the random engine
for SSL connections. See also the --egd-file option.
Example:
curl --random-file rubbish https://example.com
See also --egd-file.
-r, --range <range>
(HTTP FTP SFTP FILE) Retrieve a byte range (i.e. a partial docu‐
ment) from an HTTP/1.1, FTP or SFTP server or a local FILE.
Ranges can be specified in a number of ways.
0-499 specifies the first 500 bytes
500-999 specifies the second 500 bytes
-500 specifies the last 500 bytes
9500- specifies the bytes from offset 9500 and forward
0-0,-1 specifies the first and last byte only(*)(HTTP)
100-199,500-599
specifies two separate 100-byte ranges(*) (HTTP)
(*) = NOTE that this will cause the server to reply with a mul‐
tipart response, which will be returned as-is by curl! Parsing
or otherwise transforming this response is the responsibility of
the caller.
Only digit characters (0-9) are valid in the 'start' and 'stop'
fields of the 'start-stop' range syntax. If a non-digit charac‐
ter is given in the range, the server's response will be unspec‐
ified, depending on the server's configuration.
You should also be aware that many HTTP/1.1 servers do not have
this feature enabled, so that when you attempt to get a range,
you will instead get the whole document.
FTP and SFTP range downloads only support the simple 'start-
stop' syntax (optionally with one of the numbers omitted). FTP
use depends on the extended FTP command SIZE.
If this option is used several times, the last one will be used.
Example:
curl --range 22-44 https://example.com
See also -C, --continue-at and -a, --append.
--raw (HTTP) When used, it disables all internal HTTP decoding of con‐
tent or transfer encodings and instead makes them passed on un‐
altered, raw.
Example:
curl --raw https://example.com
See also --tr-encoding.
-e, --referer <URL>
(HTTP) Sends the "Referrer Page" information to the HTTP server.
This can also be set with the -H, --header flag of course. When
used with -L, --location you can append ";auto" to the -e,
--referer URL to make curl automatically set the previous URL
when it follows a Location: header. The ";auto" string can be
used alone, even if you do not set an initial -e, --referer.
If this option is used several times, the last one will be used.
Examples:
curl --referer "https://fake.example" https://example.com
curl --referer "https://fake.example;auto" -L https://example.com
curl --referer ";auto" -L https://example.com
See also -A, --user-agent and -H, --header.
-J, --remote-header-name
(HTTP) This option tells the -O, --remote-name option to use the
server-specified Content-Disposition filename instead of ex‐
tracting a filename from the URL.
If the server specifies a file name and a file with that name
already exists in the current working directory it will not be
overwritten and an error will occur. If the server does not
specify a file name then this option has no effect.
There's no attempt to decode %-sequences (yet) in the provided
file name, so this option may provide you with rather unexpected
file names.
WARNING: Exercise judicious use of this option, especially on
Windows. A rogue server could send you the name of a DLL or
other file that could be loaded automatically by Windows or some
third party software.
Example:
curl -OJ https://example.com/file
See also -O, --remote-name.
--remote-name-all
This option changes the default action for all given URLs to be
dealt with as if -O, --remote-name were used for each one. So if
you want to disable that for a specific URL after --remote-name-
all has been used, you must use "-o -" or --no-remote-name.
Example:
curl --remote-name-all ftp://example.com/file1 ftp://example.com/file2
See also -O, --remote-name.
-O, --remote-name
Write output to a local file named like the remote file we get.
(Only the file part of the remote file is used, the path is cut
off.)
The file will be saved in the current working directory. If you
want the file saved in a different directory, make sure you
change the current working directory before invoking curl with
this option.
The remote file name to use for saving is extracted from the
given URL, nothing else, and if it already exists it will be
overwritten. If you want the server to be able to choose the
file name refer to -J, --remote-header-name which can be used in
addition to this option. If the server chooses a file name and
that name already exists it will not be overwritten.
There is no URL decoding done on the file name. If it has %20 or
other URL encoded parts of the name, they will end up as-is as
file name.
You may use this option as many times as the number of URLs you
have.
Example:
curl -O https://example.com/filename
See also --remote-name-all.
-R, --remote-time
When used, this will make curl attempt to figure out the time‐
stamp of the remote file, and if that is available make the lo‐
cal file get that same timestamp.
Example:
curl --remote-time -o foo https://example.com
See also -O, --remote-name and -z, --time-cond.
--request-target <path>
(HTTP) Tells curl to use an alternative "target" (path) instead
of using the path as provided in the URL. Particularly useful
when wanting to issue HTTP requests without leading slash or
other data that does not follow the regular URL pattern, like
"OPTIONS *".
Example:
curl --request-target "*" -X OPTIONS https://example.com
See also -X, --request. Added in 7.55.0.
-X, --request <method>
(HTTP) Specifies a custom request method to use when communicat‐
ing with the HTTP server. The specified request method will be
used instead of the method otherwise used (which defaults to
GET). Read the HTTP 1.1 specification for details and explana‐
tions. Common additional HTTP requests include PUT and DELETE,
but related technologies like WebDAV offers PROPFIND, COPY, MOVE
and more.
Normally you do not need this option. All sorts of GET, HEAD,
POST and PUT requests are rather invoked by using dedicated com‐
mand line options.
This option only changes the actual word used in the HTTP re‐
quest, it does not alter the way curl behaves. So for example if
you want to make a proper HEAD request, using -X HEAD will not
suffice. You need to use the -I, --head option.
The method string you set with -X, --request will be used for
all requests, which if you for example use -L, --location may
cause unintended side-effects when curl does not change request
method according to the HTTP 30x response codes - and similar.
(FTP) Specifies a custom FTP command to use instead of LIST when
doing file lists with FTP.
(POP3) Specifies a custom POP3 command to use instead of LIST or
RETR.
(IMAP) Specifies a custom IMAP command to use instead of LIST.
(Added in 7.30.0)
(SMTP) Specifies a custom SMTP command to use instead of HELP or
VRFY. (Added in 7.34.0)
If this option is used several times, the last one will be used.
Examples:
curl -X "DELETE" https://example.com
curl -X NLST ftp://example.com/
See also --request-target.
--resolve <[+]host:port:addr[,addr]...>
Provide a custom address for a specific host and port pair. Us‐
ing this, you can make the curl requests(s) use a specified ad‐
dress and prevent the otherwise normally resolved address to be
used. Consider it a sort of /etc/hosts alternative provided on
the command line. The port number should be the number used for
the specific protocol the host will be used for. It means you
need several entries if you want to provide address for the same
host but different ports.
By specifying '*' as host you can tell curl to resolve any host
and specific port pair to the specified address. Wildcard is re‐
solved last so any --resolve with a specific host and port will
be used first.
The provided address set by this option will be used even if -4,
--ipv4 or -6, --ipv6 is set to make curl use another IP version.
By prefixing the host with a '+' you can make the entry time out
after curl's default timeout (1 minute). Note that this will
only make sense for long running parallel transfers with a lot
of files. In such cases, if this option is used curl will try to
resolve the host as it normally would once the timeout has ex‐
pired.
Support for providing the IP address within [brackets] was added
in 7.57.0.
Support for providing multiple IP addresses per entry was added
in 7.59.0.
Support for resolving with wildcard was added in 7.64.0.
Support for the '+' prefix was was added in 7.75.0.
This option can be used many times to add many host names to re‐
solve.
Example:
curl --resolve example.com:443:127.0.0.1 https://example.com
See also --connect-to and --alt-svc.
--retry-all-errors
Retry on any error. This option is used together with --retry.
This option is the "sledgehammer" of retrying. Do not use this
option by default (eg in curlrc), there may be unintended conse‐
quences such as sending or receiving duplicate data. Do not use
with redirected input or output. You'd be much better off han‐
dling your unique problems in shell script. Please read the ex‐
ample below.
WARNING: For server compatibility curl attempts to retry failed
flaky transfers as close as possible to how they were started,
but this is not possible with redirected input or output. For
example, before retrying it removes output data from a failed
partial transfer that was written to an output file. However
this is not true of data redirected to a | pipe or > file, which
are not reset. We strongly suggest you do not parse or record
output via redirect in combination with this option, since you
may receive duplicate data.
By default curl will not error on an HTTP response code that in‐
dicates an HTTP error, if the transfer was successful. For exam‐
ple, if a server replies 404 Not Found and the reply is fully
received then that is not an error. When --retry is used then
curl will retry on some HTTP response codes that indicate tran‐
sient HTTP errors, but that does not include most 4xx response
codes such as 404. If you want to retry on all response codes
that indicate HTTP errors (4xx and 5xx) then combine with -f,
--fail.
Example:
curl --retry 5 --retry-all-errors https://example.com
See also --retry. Added in 7.71.0.
--retry-connrefused
In addition to the other conditions, consider ECONNREFUSED as a
transient error too for --retry. This option is used together
with --retry.
Example:
curl --retry-connrefused --retry https://example.com
See also --retry and --retry-all-errors. Added in 7.52.0.
--retry-delay <seconds>
Make curl sleep this amount of time before each retry when a
transfer has failed with a transient error (it changes the de‐
fault backoff time algorithm between retries). This option is
only interesting if --retry is also used. Setting this delay to
zero will make curl use the default backoff time.
If this option is used several times, the last one will be used.
Example:
curl --retry-delay 5 --retry https://example.com
See also --retry.
--retry-max-time <seconds>
The retry timer is reset before the first transfer attempt. Re‐
tries will be done as usual (see --retry) as long as the timer
has not reached this given limit. Notice that if the timer has
not reached the limit, the request will be made and while per‐
forming, it may take longer than this given time period. To
limit a single request's maximum time, use -m, --max-time. Set
this option to zero to not timeout retries.
If this option is used several times, the last one will be used.
Example:
curl --retry-max-time 30 --retry 10 https://example.com
See also --retry.
--retry <num>
If a transient error is returned when curl tries to perform a
transfer, it will retry this number of times before giving up.
Setting the number to 0 makes curl do no retries (which is the
default). Transient error means either: a timeout, an FTP 4xx
response code or an HTTP 408, 429, 500, 502, 503 or 504 response
code.
When curl is about to retry a transfer, it will first wait one
second and then for all forthcoming retries it will double the
waiting time until it reaches 10 minutes which then will be the
delay between the rest of the retries. By using --retry-delay
you disable this exponential backoff algorithm. See also
--retry-max-time to limit the total time allowed for retries.
Since curl 7.66.0, curl will comply with the Retry-After: re‐
sponse header if one was present to know when to issue the next
retry.
If this option is used several times, the last one will be used.
Example:
curl --retry 7 https://example.com
See also --retry-max-time.
--sasl-authzid <identity>
Use this authorisation identity (authzid), during SASL PLAIN au‐
thentication, in addition to the authentication identity (auth‐
cid) as specified by -u, --user.
If the option is not specified, the server will derive the au‐
thzid from the authcid, but if specified, and depending on the
server implementation, it may be used to access another user's
inbox, that the user has been granted access to, or a shared
mailbox for example.
Example:
curl --sasl-authzid zid imap://example.com/
See also --login-options. Added in 7.66.0.
--sasl-ir
Enable initial response in SASL authentication.
Example:
curl --sasl-ir imap://example.com/
See also --sasl-authzid. Added in 7.31.0.
--service-name <name>
This option allows you to change the service name for SPNEGO.
Examples: --negotiate --service-name sockd would use
sockd/server-name.
Example:
curl --service-name sockd/server https://example.com
See also --negotiate and --proxy-service-name. Added in 7.43.0.
-S, --show-error
When used with -s, --silent, it makes curl show an error message
if it fails.
This option is global and does not need to be specified for each
use of -:, --next.
Example:
curl --show-error --silent https://example.com
See also --no-progress-meter.
-s, --silent
Silent or quiet mode. Do not show progress meter or error mes‐
sages. Makes Curl mute. It will still output the data you ask
for, potentially even to the terminal/stdout unless you redirect
it.
Use -S, --show-error in addition to this option to disable
progress meter but still show error messages.
Example:
curl -s https://example.com
See also -v, --verbose, --stderr and --no-progress-meter.
--socks4 <host[:port]>
Use the specified SOCKS4 proxy. If the port number is not speci‐
fied, it is assumed at port 1080. Using this socket type make
curl resolve the host name and passing the address on to the
proxy.
This option overrides any previous use of -x, --proxy, as they
are mutually exclusive.
This option is superfluous since you can specify a socks4 proxy
with -x, --proxy using a socks4:// protocol prefix.
Since 7.52.0, --preproxy can be used to specify a SOCKS proxy at
the same time -x, --proxy is used with an HTTP/HTTPS proxy. In
such a case curl first connects to the SOCKS proxy and then con‐
nects (through SOCKS) to the HTTP or HTTPS proxy.
If this option is used several times, the last one will be used.
Example:
curl --socks4 hostname:4096 https://example.com
See also --socks4a, --socks5 and --socks5-hostname.
--socks4a <host[:port]>
Use the specified SOCKS4a proxy. If the port number is not spec‐
ified, it is assumed at port 1080. This asks the proxy to re‐
solve the host name.
This option overrides any previous use of -x, --proxy, as they
are mutually exclusive.
This option is superfluous since you can specify a socks4a proxy
with -x, --proxy using a socks4a:// protocol prefix.
Since 7.52.0, --preproxy can be used to specify a SOCKS proxy at
the same time -x, --proxy is used with an HTTP/HTTPS proxy. In
such a case curl first connects to the SOCKS proxy and then con‐
nects (through SOCKS) to the HTTP or HTTPS proxy.
If this option is used several times, the last one will be used.
Example:
curl --socks4a hostname:4096 https://example.com
See also --socks4, --socks5 and --socks5-hostname.
--socks5-basic
Tells curl to use username/password authentication when connect‐
ing to a SOCKS5 proxy. The username/password authentication is
enabled by default. Use --socks5-gssapi to force GSS-API au‐
thentication to SOCKS5 proxies.
Example:
curl --socks5-basic --socks5 hostname:4096 https://example.com
See also --socks5. Added in 7.55.0.
--socks5-gssapi-nec
As part of the GSS-API negotiation a protection mode is negoti‐
ated. RFC 1961 says in section 4.3/4.4 it should be protected,
but the NEC reference implementation does not. The option
--socks5-gssapi-nec allows the unprotected exchange of the pro‐
tection mode negotiation.
Example:
curl --socks5-gssapi-nec --socks5 hostname:4096 https://example.com
See also --socks5.
--socks5-gssapi-service <name>
The default service name for a socks server is rcmd/server-fqdn.
This option allows you to change it.
Examples: --socks5 proxy-name --socks5-gssapi-service sockd
would use sockd/proxy-name --socks5 proxy-name --socks5-gssapi-
service sockd/real-name would use sockd/real-name for cases
where the proxy-name does not match the principal name.
Example:
curl --socks5-gssapi-service sockd --socks5 hostname:4096 https://example.com
See also --socks5.
--socks5-gssapi
Tells curl to use GSS-API authentication when connecting to a
SOCKS5 proxy. The GSS-API authentication is enabled by default
(if curl is compiled with GSS-API support). Use --socks5-basic
to force username/password authentication to SOCKS5 proxies.
Example:
curl --socks5-gssapi --socks5 hostname:4096 https://example.com
See also --socks5. Added in 7.55.0.
--socks5-hostname <host[:port]>
Use the specified SOCKS5 proxy (and let the proxy resolve the
host name). If the port number is not specified, it is assumed
at port 1080.
This option overrides any previous use of -x, --proxy, as they
are mutually exclusive.
This option is superfluous since you can specify a socks5 host‐
name proxy with -x, --proxy using a socks5h:// protocol prefix.
Since 7.52.0, --preproxy can be used to specify a SOCKS proxy at
the same time -x, --proxy is used with an HTTP/HTTPS proxy. In
such a case curl first connects to the SOCKS proxy and then con‐
nects (through SOCKS) to the HTTP or HTTPS proxy.
If this option is used several times, the last one will be used.
Example:
curl --socks5-hostname proxy.example:7000 https://example.com
See also --socks5 and --socks4a.
--socks5 <host[:port]>
Use the specified SOCKS5 proxy - but resolve the host name lo‐
cally. If the port number is not specified, it is assumed at
port 1080.
This option overrides any previous use of -x, --proxy, as they
are mutually exclusive.
This option is superfluous since you can specify a socks5 proxy
with -x, --proxy using a socks5:// protocol prefix.
Since 7.52.0, --preproxy can be used to specify a SOCKS proxy at
the same time -x, --proxy is used with an HTTP/HTTPS proxy. In
such a case curl first connects to the SOCKS proxy and then con‐
nects (through SOCKS) to the HTTP or HTTPS proxy.
If this option is used several times, the last one will be used.
This option (as well as --socks4) does not work with IPV6, FTPS
or LDAP.
Example:
curl --socks5 proxy.example:7000 https://example.com
See also --socks5-hostname and --socks4a.
-Y, --speed-limit <speed>
If a download is slower than this given speed (in bytes per sec‐
ond) for speed-time seconds it gets aborted. speed-time is set
with -y, --speed-time and is 30 if not set.
If this option is used several times, the last one will be used.
Example:
curl --speed-limit 300 --speed-time 10 https://example.com
See also -y, --speed-time, --limit-rate and -m, --max-time.
-y, --speed-time <seconds>
If a download is slower than speed-limit bytes per second during
a speed-time period, the download gets aborted. If speed-time is
used, the default speed-limit will be 1 unless set with -Y,
--speed-limit.
This option controls transfers and thus will not affect slow
connects etc. If this is a concern for you, try the --connect-
timeout option.
If this option is used several times, the last one will be used.
Example:
curl --speed-limit 300 --speed-time 10 https://example.com
See also -Y, --speed-limit and --limit-rate.
--ssl-allow-beast
This option tells curl to not work around a security flaw in the
SSL3 and TLS1.0 protocols known as BEAST. If this option is not
used, the SSL layer may use workarounds known to cause interop‐
erability problems with some older SSL implementations.
WARNING: this option loosens the SSL security, and by using this
flag you ask for exactly that.
Example:
curl --ssl-allow-beast https://example.com
See also --proxy-ssl-allow-beast and -k, --insecure.
--ssl-auto-client-cert
Tell libcurl to automatically locate and use a client certifi‐
cate for authentication, when requested by the server. This op‐
tion is only supported for Schannel (the native Windows SSL li‐
brary). Prior to 7.77.0 this was the default behavior in libcurl
with Schannel. Since the server can request any certificate that
supports client authentication in the OS certificate store it
could be a privacy violation and unexpected.
Example:
curl --ssl-auto-client-cert https://example.com
See also --proxy-ssl-auto-client-cert. Added in 7.77.0.
--ssl-no-revoke
(Schannel) This option tells curl to disable certificate revoca‐
tion checks. WARNING: this option loosens the SSL security, and
by using this flag you ask for exactly that.
Example:
curl --ssl-no-revoke https://example.com
See also --crlfile. Added in 7.44.0.
--ssl-reqd
(FTP IMAP POP3 SMTP LDAP) Require SSL/TLS for the connection.
Terminates the connection if the server does not support
SSL/TLS.
This option is handled in LDAP since version 7.81.0. It is fully
supported by the openldap backend and rejected by the generic
ldap backend if explicit TLS is required.
This option was formerly known as --ftp-ssl-reqd.
Example:
curl --ssl-reqd ftp://example.com
See also --ssl and -k, --insecure.
--ssl-revoke-best-effort
(Schannel) This option tells curl to ignore certificate revoca‐
tion checks when they failed due to missing/offline distribution
points for the revocation check lists.
Example:
curl --ssl-revoke-best-effort https://example.com
See also --crlfile and -k, --insecure. Added in 7.70.0.
--ssl (FTP IMAP POP3 SMTP LDAP) Try to use SSL/TLS for the connection.
Reverts to a non-secure connection if the server does not sup‐
port SSL/TLS. See also --ftp-ssl-control and --ssl-reqd for dif‐
ferent levels of encryption required.
This option is handled in LDAP since version 7.81.0. It is fully
supported by the openldap backend and ignored by the generic
ldap backend.
Please note that a server may close the connection if the nego‐
tiation does not succeed.
This option was formerly known as --ftp-ssl. That option name
can still be used but will be removed in a future version.
Example:
curl --ssl pop3://example.com/
See also -k, --insecure and --ciphers.
-2, --sslv2
(SSL) This option previously asked curl to use SSLv2, but start‐
ing in curl 7.77.0 this instruction is ignored. SSLv2 is widely
considered insecure (see RFC 6176).
Example:
curl --sslv2 https://example.com
See also --http1.1 and --http2. -2, --sslv2 requires that the
underlying libcurl was built to support TLS. This option over‐
rides -3, --sslv3 and -1, --tlsv1 and --tlsv1.1 and --tlsv1.2.
-3, --sslv3
(SSL) This option previously asked curl to use SSLv3, but start‐
ing in curl 7.77.0 this instruction is ignored. SSLv3 is widely
considered insecure (see RFC 7568).
Example:
curl --sslv3 https://example.com
See also --http1.1 and --http2. -3, --sslv3 requires that the
underlying libcurl was built to support TLS. This option over‐
rides -2, --sslv2 and -1, --tlsv1 and --tlsv1.1 and --tlsv1.2.
--stderr <file>
Redirect all writes to stderr to the specified file instead. If
the file name is a plain '-', it is instead written to stdout.
This option is global and does not need to be specified for each
use of -:, --next.
If this option is used several times, the last one will be used.
Example:
curl --stderr output.txt https://example.com
See also -v, --verbose and -s, --silent.
--styled-output
Enables the automatic use of bold font styles when writing HTTP
headers to the terminal. Use --no-styled-output to switch them
off.
This option is global and does not need to be specified for each
use of -:, --next.
Example:
curl --styled-output -I https://example.com
See also -I, --head and -v, --verbose. Added in 7.61.0.
--suppress-connect-headers
When -p, --proxytunnel is used and a CONNECT request is made do
not output proxy CONNECT response headers. This option is meant
to be used with -D, --dump-header or -i, --include which are
used to show protocol headers in the output. It has no effect on
debug options such as -v, --verbose or --trace, or any statis‐
tics.
Example:
curl --suppress-connect-headers --include -x proxy https://example.com
See also -D, --dump-header, -i, --include and -p, --proxytunnel.
Added in 7.54.0.
--tcp-fastopen
Enable use of TCP Fast Open (RFC7413).
Example:
curl --tcp-fastopen https://example.com
See also --false-start. Added in 7.49.0.
--tcp-nodelay
Turn on the TCP_NODELAY option. See the curl_easy_setopt(3) man
page for details about this option.
Since 7.50.2, curl sets this option by default and you need to
explicitly switch it off if you do not want it on.
Example:
curl --tcp-nodelay https://example.com
See also -N, --no-buffer.
-t, --telnet-option <opt=val>
Pass options to the telnet protocol. Supported options are:
TTYPE=<term> Sets the terminal type.
XDISPLOC=<X display> Sets the X display location.
NEW_ENV=<var,val> Sets an environment variable.
Example:
curl -t TTYPE=vt100 telnet://example.com/
See also -K, --config.
--tftp-blksize <value>
(TFTP) Set TFTP BLKSIZE option (must be >512). This is the block
size that curl will try to use when transferring data to or from
a TFTP server. By default 512 bytes will be used.
If this option is used several times, the last one will be used.
Example:
curl --tftp-blksize 1024 tftp://example.com/file
See also --tftp-no-options.
--tftp-no-options
(TFTP) Tells curl not to send TFTP options requests.
This option improves interop with some legacy servers that do
not acknowledge or properly implement TFTP options. When this
option is used --tftp-blksize is ignored.
Example:
curl --tftp-no-options tftp://192.168.0.1/
See also --tftp-blksize. Added in 7.48.0.
-z, --time-cond <time>
(HTTP FTP) Request a file that has been modified later than the
given time and date, or one that has been modified before that
time. The <date expression> can be all sorts of date strings or
if it does not match any internal ones, it is taken as a file‐
name and tries to get the modification date (mtime) from <file>
instead. See the curl_getdate(3) man pages for date expression
details.
Start the date expression with a dash (-) to make it request for
a document that is older than the given date/time, default is a
document that is newer than the specified date/time.
If this option is used several times, the last one will be used.
Examples:
curl -z "Wed 01 Sep 2021 12:18:00" https://example.com
curl -z "-Wed 01 Sep 2021 12:18:00" https://example.com
curl -z file https://example.com
See also --etag-compare and -R, --remote-time.
--tls-max <VERSION>
(SSL) VERSION defines maximum supported TLS version. The minimum
acceptable version is set by tlsv1.0, tlsv1.1, tlsv1.2 or
tlsv1.3.
If the connection is done without TLS, this option has no ef‐
fect. This includes QUIC-using (HTTP/3) transfers.
default
Use up to recommended TLS version.
1.0 Use up to TLSv1.0.
1.1 Use up to TLSv1.1.
1.2 Use up to TLSv1.2.
1.3 Use up to TLSv1.3.
Examples:
curl --tls-max 1.2 https://example.com
curl --tls-max 1.3 --tlsv1.2 https://example.com
See also --tlsv1.0, --tlsv1.1, --tlsv1.2 and --tlsv1.3. --tls-max re‐
quires that the underlying libcurl was built to support TLS. Added in
7.54.0.
--tls13-ciphers <ciphersuite list>
(TLS) Specifies which cipher suites to use in the connection if
it negotiates TLS 1.3. The list of ciphers suites must specify
valid ciphers. Read up on TLS 1.3 cipher suite details on this
URL:
https://curl.se/docs/ssl-ciphers.html
This option is currently used only when curl is built to use
OpenSSL 1.1.1 or later. If you are using a different SSL backend
you can try setting TLS 1.3 cipher suites by using the --ciphers
option.
If this option is used several times, the last one will be used.
Example:
curl --tls13-ciphers TLS_AES_128_GCM_SHA256 https://example.com
See also --ciphers and --curves. Added in 7.61.0.
--tlsauthtype <type>
Set TLS authentication type. Currently, the only supported op‐
tion is "SRP", for TLS-SRP (RFC 5054). If --tlsuser and
--tlspassword are specified but --tlsauthtype is not, then this
option defaults to "SRP". This option works only if the underly‐
ing libcurl is built with TLS-SRP support, which requires
OpenSSL or GnuTLS with TLS-SRP support.
Example:
curl --tlsauthtype SRP https://example.com
See also --tlsuser.
--tlspassword <string>
Set password for use with the TLS authentication method speci‐
fied with --tlsauthtype. Requires that --tlsuser also be set.
This option does not work with TLS 1.3.
Example:
curl --tlspassword pwd --tlsuser user https://example.com
See also --tlsuser.
--tlsuser <name>
Set username for use with the TLS authentication method speci‐
fied with --tlsauthtype. Requires that --tlspassword also is
set.
This option does not work with TLS 1.3.
Example:
curl --tlspassword pwd --tlsuser user https://example.com
See also --tlspassword.
--tlsv1.0
(TLS) Forces curl to use TLS version 1.0 or later when connect‐
ing to a remote TLS server.
In old versions of curl this option was documented to allow
_only_ TLS 1.0. That behavior was inconsistent depending on the
TLS library. Use --tls-max if you want to set a maximum TLS ver‐
sion.
Example:
curl --tlsv1.0 https://example.com
See also --tlsv1.3. Added in 7.34.0.
--tlsv1.1
(TLS) Forces curl to use TLS version 1.1 or later when connect‐
ing to a remote TLS server.
In old versions of curl this option was documented to allow
_only_ TLS 1.1. That behavior was inconsistent depending on the
TLS library. Use --tls-max if you want to set a maximum TLS ver‐
sion.
Example:
curl --tlsv1.1 https://example.com
See also --tlsv1.3. Added in 7.34.0.
--tlsv1.2
(TLS) Forces curl to use TLS version 1.2 or later when connect‐
ing to a remote TLS server.
In old versions of curl this option was documented to allow
_only_ TLS 1.2. That behavior was inconsistent depending on the
TLS library. Use --tls-max if you want to set a maximum TLS ver‐
sion.
Example:
curl --tlsv1.2 https://example.com
See also --tlsv1.3. Added in 7.34.0.
--tlsv1.3
(TLS) Forces curl to use TLS version 1.3 or later when connect‐
ing to a remote TLS server.
If the connection is done without TLS, this option has no ef‐
fect. This includes QUIC-using (HTTP/3) transfers.
Note that TLS 1.3 is not supported by all TLS backends.
Example:
curl --tlsv1.3 https://example.com
See also --tlsv1.2. Added in 7.52.0.
-1, --tlsv1
(SSL) Tells curl to use at least TLS version 1.x when negotiat‐
ing with a remote TLS server. That means TLS version 1.0 or
higher
Example:
curl --tlsv1 https://example.com
See also --http1.1 and --http2. -1, --tlsv1 requires that the
underlying libcurl was built to support TLS. This option over‐
rides --tlsv1.1 and --tlsv1.2 and --tlsv1.3.
--tr-encoding
(HTTP) Request a compressed Transfer-Encoding response using one
of the algorithms curl supports, and uncompress the data while
receiving it.
Example:
curl --tr-encoding https://example.com
See also --compressed.
--trace-ascii <file>
Enables a full trace dump of all incoming and outgoing data, in‐
cluding descriptive information, to the given output file. Use
"-" as filename to have the output sent to stdout.
This is similar to --trace, but leaves out the hex part and only
shows the ASCII part of the dump. It makes smaller output that
might be easier to read for untrained humans.
This option is global and does not need to be specified for each
use of -:, --next.
If this option is used several times, the last one will be used.
Example:
curl --trace-ascii log.txt https://example.com
See also -v, --verbose and --trace. This option overrides
--trace and -v, --verbose.
--trace-time
Prepends a time stamp to each trace or verbose line that curl
displays.
This option is global and does not need to be specified for each
use of -:, --next.
Example:
curl --trace-time --trace-ascii output https://example.com
See also --trace and -v, --verbose.
--trace <file>
Enables a full trace dump of all incoming and outgoing data, in‐
cluding descriptive information, to the given output file. Use
"-" as filename to have the output sent to stdout. Use "%" as
filename to have the output sent to stderr.
This option is global and does not need to be specified for each
use of -:, --next.
If this option is used several times, the last one will be used.
Example:
curl --trace log.txt https://example.com
See also --trace-ascii and --trace-time. This option overrides
-v, --verbose and --trace-ascii.
--unix-socket <path>
(HTTP) Connect through this Unix domain socket, instead of using
the network.
Example:
curl --unix-socket socket-path https://example.com
See also --abstract-unix-socket. Added in 7.40.0.
-T, --upload-file <file>
This transfers the specified local file to the remote URL. If
there is no file part in the specified URL, curl will append the
local file name. NOTE that you must use a trailing / on the last
directory to really prove to Curl that there is no file name or
curl will think that your last directory name is the remote file
name to use. That will most likely cause the upload operation to
fail. If this is used on an HTTP(S) server, the PUT command will
be used.
Use the file name "-" (a single dash) to use stdin instead of a
given file. Alternately, the file name "." (a single period)
may be specified instead of "-" to use stdin in non-blocking
mode to allow reading server output while stdin is being up‐
loaded.
You can specify one -T, --upload-file for each URL on the com‐
mand line. Each -T, --upload-file + URL pair specifies what to
upload and to where. curl also supports "globbing" of the -T,
--upload-file argument, meaning that you can upload multiple
files to a single URL by using the same URL globbing style sup‐
ported in the URL.
When uploading to an SMTP server: the uploaded data is assumed
to be RFC 5322 formatted. It has to feature the necessary set of
headers and mail body formatted correctly by the user as curl
will not transcode nor encode it further in any way.
Examples:
curl -T file https://example.com
curl -T "img[1-1000].png" ftp://ftp.example.com/
curl --upload-file "{file1,file2}" https://example.com
See also -G, --get and -I, --head.
--url <url>
Specify a URL to fetch. This option is mostly handy when you
want to specify URL(s) in a config file.
If the given URL is missing a scheme name (such as "http://" or
"ftp://" etc) then curl will make a guess based on the host. If
the outermost sub-domain name matches DICT, FTP, IMAP, LDAP,
POP3 or SMTP then that protocol will be used, otherwise HTTP
will be used. Since 7.45.0 guessing can be disabled by setting a
default protocol, see --proto-default for details.
This option may be used any number of times. To control where
this URL is written, use the -o, --output or the -O, --remote-
name options.
WARNING: On Windows, particular file:// accesses can be con‐
verted to network accesses by the operating system. Beware!
Example:
curl --url https://example.com
See also -:, --next and -K, --config.
-B, --use-ascii
(FTP LDAP) Enable ASCII transfer. For FTP, this can also be en‐
forced by using a URL that ends with ";type=A". This option
causes data sent to stdout to be in text mode for win32 systems.
Example:
curl -B ftp://example.com/README
See also --crlf and --data-ascii.
-A, --user-agent <name>
(HTTP) Specify the User-Agent string to send to the HTTP server.
To encode blanks in the string, surround the string with single
quote marks. This header can also be set with the -H, --header
or the --proxy-header options.
If you give an empty argument to -A, --user-agent (""), it will
remove the header completely from the request. If you prefer a
blank header, you can set it to a single space (" ").
If this option is used several times, the last one will be used.
Example:
curl -A "Agent 007" https://example.com
See also -H, --header and --proxy-header.
-u, --user <user:password>
Specify the user name and password to use for server authentica‐
tion. Overrides -n, --netrc and --netrc-optional.
If you simply specify the user name, curl will prompt for a
password.
The user name and passwords are split up on the first colon,
which makes it impossible to use a colon in the user name with
this option. The password can, still.
On systems where it works, curl will hide the given option argu‐
ment from process listings. This is not enough to protect cre‐
dentials from possibly getting seen by other users on the same
system as they will still be visible for a moment before
cleared. Such sensitive data should be retrieved from a file in‐
stead or similar and never used in clear text in a command line.
When using Kerberos V5 with a Windows based server you should
include the Windows domain name in the user name, in order for
the server to successfully obtain a Kerberos Ticket. If you do
not, then the initial authentication handshake may fail.
When using NTLM, the user name can be specified simply as the
user name, without the domain, if there is a single domain and
forest in your setup for example.
To specify the domain name use either Down-Level Logon Name or
UPN (User Principal Name) formats. For example, EXAMPLE\user and
user@example.com respectively.
If you use a Windows SSPI-enabled curl binary and perform Ker‐
beros V5, Negotiate, NTLM or Digest authentication then you can
tell curl to select the user name and password from your envi‐
ronment by specifying a single colon with this option: "-u :".
If this option is used several times, the last one will be used.
Example:
curl -u user:secret https://example.com
See also -n, --netrc and -K, --config.
-v, --verbose
Makes curl verbose during the operation. Useful for debugging
and seeing what's going on "under the hood". A line starting
with '>' means "header data" sent by curl, '<' means "header
data" received by curl that is hidden in normal cases, and a
line starting with '*' means additional info provided by curl.
If you only want HTTP headers in the output, -i, --include might
be the option you are looking for.
If you think this option still does not give you enough details,
consider using --trace or --trace-ascii instead.
This option is global and does not need to be specified for each
use of -:, --next.
Use -s, --silent to make curl really quiet.
Example:
curl --verbose https://example.com
See also -i, --include. This option overrides --trace and
--trace-ascii.
-V, --version
Displays information about curl and the libcurl version it uses.
The first line includes the full version of curl, libcurl and
other 3rd party libraries linked with the executable.
The second line (starts with "Protocols:") shows all protocols
that libcurl reports to support.
The third line (starts with "Features:") shows specific features
libcurl reports to offer. Available features include:
alt-svc
Support for the Alt-Svc: header is provided.
AsynchDNS
This curl uses asynchronous name resolves. Asynchronous
name resolves can be done using either the c-ares or the
threaded resolver backends.
brotli Support for automatic brotli compression over HTTP(S).
CharConv
curl was built with support for character set conversions
(like EBCDIC)
Debug This curl uses a libcurl built with Debug. This enables
more error-tracking and memory debugging etc. For curl-
developers only!
gsasl The built-in SASL authentication includes extensions to
support SCRAM because libcurl was built with libgsasl.
GSS-API
GSS-API is supported.
HSTS HSTS support is present.
HTTP2 HTTP/2 support has been built-in.
HTTP3 HTTP/3 support has been built-in.
HTTPS-proxy
This curl is built to support HTTPS proxy.
IDN This curl supports IDN - international domain names.
IPv6 You can use IPv6 with this.
Kerberos
Kerberos V5 authentication is supported.
Largefile
This curl supports transfers of large files, files larger
than 2GB.
libz Automatic decompression (via gzip, deflate) of compressed
files over HTTP is supported.
MultiSSL
This curl supports multiple TLS backends.
NTLM NTLM authentication is supported.
NTLM_WB
NTLM delegation to winbind helper is supported.
PSL PSL is short for Public Suffix List and means that this
curl has been built with knowledge about "public suf‐
fixes".
SPNEGO SPNEGO authentication is supported.
SSL SSL versions of various protocols are supported, such as
HTTPS, FTPS, POP3S and so on.
SSPI SSPI is supported.
TLS-SRP
SRP (Secure Remote Password) authentication is supported
for TLS.
TrackMemory
Debug memory tracking is supported.
Unicode
Unicode support on Windows.
UnixSockets
Unix sockets support is provided.
zstd Automatic decompression (via zstd) of compressed files
over HTTP is supported.
Example:
curl --version
See also -h, --help and -M, --manual.
-w, --write-out <format>
Make curl display information on stdout after a completed trans‐
fer. The format is a string that may contain plain text mixed
with any number of variables. The format can be specified as a
literal "string", or you can have curl read the format from a
file with "@filename" and to tell curl to read the format from
stdin you write "@-".
The variables present in the output format will be substituted
by the value or text that curl thinks fit, as described below.
All variables are specified as %{variable_name} and to output a
normal % you just write them as %%. You can output a newline by
using \n, a carriage return with \r and a tab space with \t.
The output will be written to standard output, but this can be
switched to standard error by using %{stderr}.
NOTE: The %-symbol is a special symbol in the win32-environment,
where all occurrences of % must be doubled when using this op‐
tion.
The variables available are:
content_type The Content-Type of the requested document, if
there was any.
errormsg The error message. (Added in 7.75.0)
exitcode The numerical exitcode of the transfer. (Added in
7.75.0)
filename_effective
The ultimate filename that curl writes out to.
This is only meaningful if curl is told to write
to a file with the -O, --remote-name or -o,
--output option. It's most useful in combination
with the -J, --remote-header-name option.
ftp_entry_path The initial path curl ended up in when logging on
to the remote FTP server.
http_code The numerical response code that was found in the
last retrieved HTTP(S) or FTP(s) transfer.
http_connect The numerical code that was found in the last re‐
sponse (from a proxy) to a curl CONNECT request.
http_version The http version that was effectively used.
(Added in 7.50.0)
json A JSON object with all available keys.
local_ip The IP address of the local end of the most re‐
cently done connection - can be either IPv4 or
IPv6.
local_port The local port number of the most recently done
connection.
method The http method used in the most recent HTTP re‐
quest. (Added in 7.72.0)
num_connects Number of new connects made in the recent trans‐
fer.
num_headers The number of response headers in the most recent
request (restarted at each
redirect). Note that the status line IS NOT a header. (Added in 7.73.0)
num_redirects Number of redirects that were followed in the re‐
quest.
onerror The rest of the output is only shown if the
transfer returned a non-zero error (Added in
7.75.0)
proxy_ssl_verify_result
The result of the HTTPS proxy's SSL peer certifi‐
cate verification that was requested. 0 means the
verification was successful. (Added in 7.52.0)
redirect_url When an HTTP request was made without -L, --loca‐
tion to follow redirects (or when --max-redirs is
met), this variable will show the actual URL a
redirect would have gone to.
referer The Referer: header, if there was any. (Added in
7.76.0)
remote_ip The remote IP address of the most recently done
connection - can be either IPv4 or IPv6.
remote_port The remote port number of the most recently done
connection.
response_code The numerical response code that was found in the
last transfer (formerly known as "http_code").
scheme The URL scheme (sometimes called protocol) that
was effectively used. (Added in 7.52.0)
size_download The total amount of bytes that were downloaded.
This is the size of the body/data that was trans‐
ferred, excluding headers.
size_header The total amount of bytes of the downloaded head‐
ers.
size_request The total amount of bytes that were sent in the
HTTP request.
size_upload The total amount of bytes that were uploaded.
This is the size of the body/data that was trans‐
ferred, excluding headers.
speed_download The average download speed that curl measured for
the complete download. Bytes per second.
speed_upload The average upload speed that curl measured for
the complete upload. Bytes per second.
ssl_verify_result
The result of the SSL peer certificate verifica‐
tion that was requested. 0 means the verification
was successful.
stderr From this point on, the -w, --write-out output
will be written to standard error. (Added in
7.63.0)
stdout From this point on, the -w, --write-out output
will be written to standard output. This is the
default, but can be used to switch back after
switching to stderr. (Added in 7.63.0)
time_appconnect
The time, in seconds, it took from the start un‐
til the SSL/SSH/etc connect/handshake to the re‐
mote host was completed.
time_connect The time, in seconds, it took from the start un‐
til the TCP connect to the remote host (or proxy)
was completed.
time_namelookup
The time, in seconds, it took from the start un‐
til the name resolving was completed.
time_pretransfer
The time, in seconds, it took from the start un‐
til the file transfer was just about to begin.
This includes all pre-transfer commands and nego‐
tiations that are specific to the particular pro‐
tocol(s) involved.
time_redirect The time, in seconds, it took for all redirection
steps including name lookup, connect, pretransfer
and transfer before the final transaction was
started. time_redirect shows the complete execu‐
tion time for multiple redirections.
time_starttransfer
The time, in seconds, it took from the start un‐
til the first byte was just about to be trans‐
ferred. This includes time_pretransfer and also
the time the server needed to calculate the re‐
sult.
time_total The total time, in seconds, that the full opera‐
tion lasted.
url The URL that was fetched. (Added in 7.75.0)
urlnum The URL index number of this transfer, 0-indexed.
De-globbed URLs share the same index number as
the origin globbed URL. (Added in 7.75.0)
url_effective The URL that was fetched last. This is most mean‐
ingful if you have told curl to follow location:
headers.
If this option is used several times, the last one will be used.
Example:
curl -w '%{http_code}\n' https://example.com
See also -v, --verbose and -I, --head.
--xattr
When saving output to a file, this option tells curl to store
certain file metadata in extended file attributes. Currently,
the URL is stored in the xdg.origin.url attribute and, for HTTP,
the content type is stored in the mime_type attribute. If the
file system does not support extended attributes, a warning is
issued.
Example:
curl --xattr -o storage https://example.com
See also -R, --remote-time, -w, --write-out and -v, --verbose.
FILES
~/.curlrc
Default config file, see -K, --config for details.
ENVIRONMENT
The environment variables can be specified in lower case or upper case.
The lower case version has precedence. http_proxy is an exception as it
is only available in lower case.
Using an environment variable to set the proxy has the same effect as
using the -x, --proxy option.
http_proxy [protocol://]<host>[:port]
Sets the proxy server to use for HTTP.
HTTPS_PROXY [protocol://]<host>[:port]
Sets the proxy server to use for HTTPS.
[url-protocol]_PROXY [protocol://]<host>[:port]
Sets the proxy server to use for [url-protocol], where the pro‐
tocol is a protocol that curl supports and as specified in a
URL. FTP, FTPS, POP3, IMAP, SMTP, LDAP, etc.
ALL_PROXY [protocol://]<host>[:port]
Sets the proxy server to use if no protocol-specific proxy is
set.
NO_PROXY <comma-separated list of hosts/domains>
list of host names that should not go through any proxy. If set
to an asterisk '*' only, it matches all hosts. Each name in this
list is matched as either a domain name which contains the host‐
name, or the hostname itself.
This environment variable disables use of the proxy even when
specified with the -x, --proxy option. That is NO_PROXY=di‐
rect.example.com curl -x http://proxy.example.com http://di‐
rect.example.com accesses the target URL directly, and
NO_PROXY=direct.example.com curl -x http://proxy.example.com
http://somewhere.example.com accesses the target URL through the
proxy.
The list of host names can also be include numerical IP ad‐
dresses, and IPv6 versions should then be given without enclos‐
ing brackets.
IPv6 numerical addresses are compared as strings, so they will
only match if the representations are the same: "::1" is the
same as "::0:1" but they do not match.
APPDATA <dir>
On Windows, this variable is used when trying to find the home
directory. If the primary home variable are all unset.
COLUMNS <terminal width>
If set, the specified number of characters will be used as the
terminal width when the alternative progress-bar is shown. If
not set, curl will try to figure it out using other ways.
CURL_CA_BUNDLE <file>
If set, will be used as the --cacert value.
CURL_HOME <dir>
If set, is the first variable curl checks when trying to find
its home directory. If not set, it continues to check XDG_CON‐
FIG_HOME.
CURL_SSL_BACKEND <TLS backend>
If curl was built with support for "MultiSSL", meaning that it
has built-in support for more than one TLS backend, this envi‐
ronment variable can be set to the case insensitive name of the
particular backend to use when curl is invoked. Setting a name
that is not a built-in alternative will make curl stay with the
default.
SSL backend names (case-insensitive): bearssl, gnutls, gskit,
mbedtls, mesalink, nss, openssl, rustls, schannel, secure-trans‐
port, wolfssl
HOME <dir>
If set, this is used to find the home directory when that is
needed. Like when looking for the default .curlrc. CURL_HOME and
XDG_CONFIG_HOME have preference.
QLOGDIR <directory name>
If curl was built with HTTP/3 support, setting this environment
variable to a local directory will make curl produce qlogs in
that directory, using file names named after the destination
connection id (in hex). Do note that these files can become
rather large. Works with both QUIC backends.
SHELL Used on VMS when trying to detect if using a DCL or a "unix"
shell.
SSL_CERT_DIR <dir>
If set, will be used as the --capath value.
SSL_CERT_FILE <path>
If set, will be used as the --cacert value.
SSLKEYLOGFILE <file name>
If you set this environment variable to a file name, curl will
store TLS secrets from its connections in that file when invoked
to enable you to analyze the TLS traffic in real time using net‐
work analyzing tools such as Wireshark. This works with the fol‐
lowing TLS backends: OpenSSL, libressl, BoringSSL, GnuTLS, NSS
and wolfSSL.
USERPROFILE <dir>
On Windows, this variable is used when trying to find the home
directory. If the other, primary, variable are all unset. If
set, curl will use the path "$USERPROFILE\Application Data".
XDG_CONFIG_HOME <dir>
If CURL_HOME is not set, this variable is checked when looking
for a default .curlrc file.
PROXY PROTOCOL PREFIXES
The proxy string may be specified with a protocol:// prefix to specify
alternative proxy protocols.
If no protocol is specified in the proxy string or if the string does
not match a supported one, the proxy will be treated as an HTTP proxy.
The supported proxy protocol prefixes are as follows:
http://
Makes it use it as an HTTP proxy. The default if no scheme pre‐
fix is used.
https://
Makes it treated as an HTTPS proxy.
socks4://
Makes it the equivalent of --socks4
socks4a://
Makes it the equivalent of --socks4a
socks5://
Makes it the equivalent of --socks5
socks5h://
Makes it the equivalent of --socks5-hostname
EXIT CODES
There are a bunch of different error codes and their corresponding er‐
ror messages that may appear under error conditions. At the time of
this writing, the exit codes are:
1 Unsupported protocol. This build of curl has no support for this
protocol.
2 Failed to initialize.
3 URL malformed. The syntax was not correct.
4 A feature or option that was needed to perform the desired re‐
quest was not enabled or was explicitly disabled at build-time.
To make curl able to do this, you probably need another build of
libcurl.
5 Could not resolve proxy. The given proxy host could not be re‐
solved.
6 Could not resolve host. The given remote host could not be re‐
solved.
7 Failed to connect to host.
8 Weird server reply. The server sent data curl could not parse.
9 FTP access denied. The server denied login or denied access to
the particular resource or directory you wanted to reach. Most
often you tried to change to a directory that does not exist on
the server.
10 FTP accept failed. While waiting for the server to connect back
when an active FTP session is used, an error code was sent over
the control connection or similar.
11 FTP weird PASS reply. Curl could not parse the reply sent to the
PASS request.
12 During an active FTP session while waiting for the server to
connect back to curl, the timeout expired.
13 FTP weird PASV reply, Curl could not parse the reply sent to the
PASV request.
14 FTP weird 227 format. Curl could not parse the 227-line the
server sent.
15 FTP cannot use host. Could not resolve the host IP we got in the
227-line.
16 HTTP/2 error. A problem was detected in the HTTP2 framing layer.
This is somewhat generic and can be one out of several problems,
see the error message for details.
17 FTP could not set binary. Could not change transfer method to
binary.
18 Partial file. Only a part of the file was transferred.
19 FTP could not download/access the given file, the RETR (or simi‐
lar) command failed.
21 FTP quote error. A quote command returned error from the server.
22 HTTP page not retrieved. The requested url was not found or re‐
turned another error with the HTTP error code being 400 or
above. This return code only appears if -f, --fail is used.
23 Write error. Curl could not write data to a local filesystem or
similar.
25 FTP could not STOR file. The server denied the STOR operation,
used for FTP uploading.
26 Read error. Various reading problems.
27 Out of memory. A memory allocation request failed.
28 Operation timeout. The specified time-out period was reached ac‐
cording to the conditions.
30 FTP PORT failed. The PORT command failed. Not all FTP servers
support the PORT command, try doing a transfer using PASV in‐
stead!
31 FTP could not use REST. The REST command failed. This command is
used for resumed FTP transfers.
33 HTTP range error. The range "command" did not work.
34 HTTP post error. Internal post-request generation error.
35 SSL connect error. The SSL handshaking failed.
36 Bad download resume. Could not continue an earlier aborted down‐
load.
37 FILE could not read file. Failed to open the file. Permissions?
38 LDAP cannot bind. LDAP bind operation failed.
39 LDAP search failed.
41 Function not found. A required LDAP function was not found.
42 Aborted by callback. An application told curl to abort the oper‐
ation.
43 Internal error. A function was called with a bad parameter.
45 Interface error. A specified outgoing interface could not be
used.
47 Too many redirects. When following redirects, curl hit the maxi‐
mum amount.
48 Unknown option specified to libcurl. This indicates that you
passed a weird option to curl that was passed on to libcurl and
rejected. Read up in the manual!
49 Malformed telnet option.
51 The peer's SSL certificate or SSH MD5 fingerprint was not OK.
52 The server did not reply anything, which here is considered an
error.
53 SSL crypto engine not found.
54 Cannot set SSL crypto engine as default.
55 Failed sending network data.
56 Failure in receiving network data.
58 Problem with the local certificate.
59 Could not use specified SSL cipher.
60 Peer certificate cannot be authenticated with known CA certifi‐
cates.
61 Unrecognized transfer encoding.
62 Invalid LDAP URL.
63 Maximum file size exceeded.
64 Requested FTP SSL level failed.
65 Sending the data requires a rewind that failed.
66 Failed to initialise SSL Engine.
67 The user name, password, or similar was not accepted and curl
failed to log in.
68 File not found on TFTP server.
69 Permission problem on TFTP server.
70 Out of disk space on TFTP server.
71 Illegal TFTP operation.
72 Unknown TFTP transfer ID.
73 File already exists (TFTP).
74 No such user (TFTP).
75 Character conversion failed.
76 Character conversion functions required.
77 Problem reading the SSL CA cert (path? access rights?).
78 The resource referenced in the URL does not exist.
79 An unspecified error occurred during the SSH session.
80 Failed to shut down the SSL connection.
82 Could not load CRL file, missing or wrong format.
83 Issuer check failed.
84 The FTP PRET command failed.
85 Mismatch of RTSP CSeq numbers.
86 Mismatch of RTSP Session Identifiers.
87 Unable to parse FTP file list.
88 FTP chunk callback reported error.
89 No connection available, the session will be queued.
90 SSL public key does not matched pinned public key.
91 Invalid SSL certificate status.
92 Stream error in HTTP/2 framing layer.
93 An API function was called from inside a callback.
94 An authentication function returned an error.
95 A problem was detected in the HTTP/3 layer. This is somewhat
generic and can be one out of several problems, see the error
message for details.
96 QUIC connection error. This error may be caused by an SSL li‐
brary error. QUIC is the protocol used for HTTP/3 transfers.
XX More error codes will appear here in future releases. The exist‐
ing ones are meant to never change.
BUGS
If you experience any problems with curl, submit an issue in the
project's bug tracker on GitHub: https://github.com/curl/curl/issues
AUTHORS / CONTRIBUTORS
Daniel Stenberg is the main author, but the whole list of contributors
is found in the separate THANKS file.
WWW
https://curl.se
SEE ALSO
ftp(1), wget(1)
curl 7.81.0 January 03 2022 curl(1)
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