UE4之HTTP请求_ue4 http

UE4中的HTTP模块封装了libcurl的HTTP功能，很容易实现HTTP下载和上传功能，代码如下

class FHttpRequestTest
{
	void Download(const FString& URL)
	{
		TSharedRef HttpReuest = FHttpModule::Get().CreateRequest();
		HttpReuest->SetURL(URL);
		HttpReuest->SetVerb(TEXT("GET"));
		HttpReuest->SetHeader(TEXT("Content-Type"), TEXT("application/x-www-form-urlencoded"));
		HttpReuest->OnProcessRequestComplete().BindRaw(this, &FHttpRequestTest::OnRequestComplete);
		HttpReuest->OnRequestProgress().BindRaw(this, &FHttpRequestTest::OnRequestProgress);
		HttpReuest->ProcessRequest();
	}
	void Upload(const FString& URL, const FString& ContentString)//ContentString为需要上传的文件内容，如果不是纯文本就换成TArray类型的参数
	{
		TSharedRef HttpReuest = FHttpModule::Get().CreateRequest();
		HttpReuest->SetURL(URL);
		HttpReuest->SetVerb(TEXT("POST"));
		HttpReuest->SetHeader(TEXT("Content-Type"), TEXT("application/x-www-form-urlencoded"));
		HttpReuest->SetContentAsString(ContentString);//也可以用SetContent，只不过参数要换成TArray
		HttpReuest->OnProcessRequestComplete().BindRaw(this, &FHttpRequestTest::OnRequestComplete);
		HttpReuest->OnRequestProgress().BindRaw(this, &FHttpRequestTest::OnRequestProgress);
		HttpReuest->ProcessRequest();
	}
	//请求完成
	void OnRequestComplete(FHttpRequestPtr HttpRequest, FHttpResponsePtr HttpResponse, bool bSucceeded)
	{
		if (!HttpRequest.IsValid() || !HttpResponse.IsValid())
		{
			return;
		}
		else if (bSucceeded && EHttpResponseCodes::IsOk(HttpResponse->GetResponseCode()))
		{
			//如果是下载请求，可通过这段代码将文件保存
			FString Filename = FPaths::GetCleanFilename(HttpRequest->GetURL());
			FFileHelper::SaveArrayToFile(HttpResponse->GetContent(), *FString::Printf(TEXT("%s%s"), *FPaths::GameSavedDir(), *Filename));
		}
	}
	//请求进度
	void OnRequestProgress(FHttpRequestPtr HttpRequest, int32 BytesSent, int32 BytesReceived)
	{
	}
};

普通的HTTP请求，GET方式与下载功能一样，POST方式与上传功能一样，在下载功能中，如果不知道下载文件的大小，可通过HttpReuest->SetVerb(TEXT("HEAD"));只请求头的方式获取文件大小，文件大小在头的Content-Length字段中