当客户端想要下载文件时，nodejs服务端如何根据URL设置响应头的Content-Type类型？_nodejs curl contenttype

下面就是一个json格式的文件，包含了所有后缀名格式对应的Conent-Type类型。

{
   
    ".323": "text/h323",
    ".3gp": "video/3gpp",
    ".aab": "application/x-authoware-bin",
    ".aam": "application/x-authoware-map",
    ".aas": "application/x-authoware-seg",
    ".acx": "application/internet-property-stream",
    ".ai": "application/postscript",
    ".aif": "audio/x-aiff",
    ".aifc": "audio/x-aiff",
    ".aiff": "audio/x-aiff",
    ".als": "audio/X-Alpha5",
    ".amc": "application/x-mpeg",
    ".ani": "application/octet-stream",
    ".apk": "application/vnd.android.package-archive",
    ".asc": "text/plain",
    ".asd": "application/astound",
    ".asf": "video/x-ms-asf",
    ".asn": "application/astound",
    ".asp": "application/x-asap",
    ".asr": "video/x-ms-asf",
    ".asx": "video/x-ms-asf",
    ".au": "audio/basic",
    ".avb": "application/octet-stream",
    ".avi": "video/x-msvideo",
    ".awb": "audio/amr-wb",
    ".axs": "application/olescript",
    ".bas": "text/plain",
    ".bcpio": "application/x-bcpio",
    ".bin ": "application/octet-stream",
    ".bld": "application/bld",
    ".bld2": "application/bld2",
    ".bmp": "image/bmp",
    ".bpk": "application/octet-stream",
    ".bz2": "application/x-bzip2",
    ".c": "text/plain",
    ".cal": "image/x-cals",
    ".cat": "application/vnd.ms-pkiseccat",
    ".ccn": "application/x-cnc",
    ".cco": "application/x-cocoa",
    ".cdf": "application/x-cdf",
    ".cer": "application/x-x509-ca-cert",
    ".cgi": "magnus-internal/cgi",
    ".chat": "application/x-chat",
    ".class": "application/octet-stream",
    ".clp": "application/x-msclip",
    ".cmx": "image/x-cmx",
    ".co": "application/x-cult3d-object",
    ".cod": "image/cis-cod",
    ".conf": "text/plain",
    ".cpio": "application/x-cpio",
    ".cpp": "text/plain",
    ".cpt": "application/mac-compactpro",
    ".crd": "application/x-mscardfile",
    ".crl": "application/pkix-crl",
    ".crt": "application/x-x509-ca-cert",
    ".csh": "application/x-csh",
    ".csm": "chemical/x-csml",
    ".csml": "chemical/x-csml",
    ".css": "text/css",
    ".cur": "application/octet-stream",
    ".dcm": "x-lml/x-evm",
    ".dcr": "application/x-director",
    ".dcx": "image/x-dcx",
    ".der": "application/x-x509-ca-cert",
    ".dhtml": "text/html",
    ".dir": "application/x-director",
    ".dll": "application/x-msdownload",
    ".dmg": "application/octet-stream",
    ".dms": "application/octet-stream",
    ".doc": "application/msword",
    ".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
    ".dot": "application/msword",
    ".dvi": "application/x-dvi",
    ".dwf": "drawing/x-dwf",
    ".dwg": "application/x-autocad",
    ".dxf": "application/x-autocad",
    ".dxr": "application/x-director",
    ".ebk": "application/x-expandedbook",
    ".emb": "chemical/x-embl-dl-nucleotide",
    ".embl": "chemical/x-embl-dl-nucleotide",
    ".eps": "application/postscript",
    ".epub": "application/epub+zip",
    ".eri": "image/x-eri",
    ".es": "audio/echospeech",
    ".esl": "audio/echospeech",
    ".etc": "application/x-earthtime",
    ".etx": "text/x-setext",
    ".evm": "x-lml/x-evm",
    ".evy": "application/envoy",
    ".exe": "application/octet-stream",
    ".fh4": "image/x-freehand",
    ".fh5": "image/x-freehand",
    ".fhc": "image/x-freehand",
    ".fif": "application/fractals",
    ".flr": "x-world/x-vrml",
    ".flv": "flv-application/octet-stream",
    ".fm": "application/x-maker",
    ".fpx": "image/x-fpx",
    ".fvi": "video/isivideo",
    ".gau": "chemical/x-gaussian-input",
    ".gca": "application/x-gca-compressed",
    ".gdb": "x-lml/x-gdb",
    ".gif": "image/gif",
    ".gps": "application/x-gps",
    ".gtar": "ap
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