c# - HttpWebRequest.GetResponse 无论如何总是超时

Question

我无法使用 HttpWebRequest 向 URL 发出发布请求。我已经应用了我在网上看到的所有建议。 SO 上的大多数答案都建议指定用户代理。我已经这样做并提供了超时，但我仍然超时。我看到另一篇文章，其中提到指定 readwritetimeout 代替。我仍然得到相同的响应，“服务器超时”。使用浏览器使帖子在一秒钟内工作，但使用 C# 中的代码会出现超时问题。这是我的代码:

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); 
        request.ContentType = "application/x-www-form-urlencoded";
        request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2288.6 Safari/537.36";
        request.Method = "POST";
        request.KeepAlive = true;
        request.CookieContainer = new CookieContainer();
        request.Accept = "*/*";
        request.ReadWriteTimeout = System.Threading.Timeout.Infinite;
        request.Headers.Add("Accept-Encoding: gzip, deflate");
        request.Headers.Add("Accept-Language: en-US");
        byte[] byteArray = Encoding.UTF8.GetBytes(postData);
        request.ContentLength = byteArray.Length;
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        dataStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream);
        string Response = reader.ReadToEnd();

我在这一行超时:

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

我是不是漏掉了什么？

这是在配置中打开诊断后的日志。

System.Net Verbose: 0 : [0280] WebRequest::Create(http://mysite.url.here)
System.Net Verbose: 0 : [0280] HttpWebRequest#13062350::HttpWebRequest(http://mysite.url.here)
System.Net Information: 0 : [0280] Current OS installation type is 'Client'.
System.Net Information: 0 : [0280] RAS supported: True
System.Net Verbose: 0 : [0280] Exiting HttpWebRequest#13062350::HttpWebRequest()

System.Net Verbose: 0 : [0280] Exiting WebRequest::Create()     -> HttpWebRequest#13062350
System.Net Error: 0 : [0280] Can't retrieve proxy settings for Uri 'http://mysite.url.here'. Error code: 12180.
System.Net Verbose: 0 : [0280] ServicePoint#10366524::ServicePoint(http://mysite.url.here:80)
System.Net Information: 0 : [0280] Associating HttpWebRequest#13062350 with ServicePoint#10366524
System.Net Verbose: 0 : [0280] HttpWebRequest#13062350::GetRequestStream()
System.Net Information: 0 : [0280] Associating Connection#63840421 with HttpWebRequest#13062350
System.Net Information: 0 : [0280] Connection#63840421 - Created connection from 192.168.1.5:13902 to 199.249.234.200:80.
System.Net Information: 0 : [0280] Associating HttpWebRequest#13062350 with ConnectStream#54246671
System.Net Information: 0 : [0280] HttpWebRequest#13062350 - Request: POST /Post-url-here HTTP/1.1

System.Net Information: 0 : [0280] ConnectStream#54246671 - Sending headers
{
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, likeGecko) Chrome/42.0.2288.6 Safari/537.36
Accept-Encoding: gzip, deflate
Accept-Language: en-US
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Host: www.powersportrider.com
Content-Length: 101
Expect: 100-continue
Connection: Keep-Alive
}.

System.Net Verbose: 0 : [0280] Exiting ConnectStream#54246671::Write()
System.Net Verbose: 0 : [0280] ConnectStream#54246671::Close()
System.Net Verbose: 0 : [0280] Exiting ConnectStream#54246671::Close()
System.Net Verbose: 0 : [0280] HttpWebRequest#13062350::GetResponse()
System.Net Information: 0 : [0280] Connection#63840421 - Received status line: V
ersion=1.1, StatusCode=100, StatusDescription=Continue.
System.Net Information: 0 : [0280] Connection#63840421 - Received headers
{

}.


System.Net Verbose: 0 : [8668] HttpWebRequest#13062350::Abort(The operation hastimed out)
System.Net Verbose: 0 : [8668] Exiting HttpWebRequest#13062350::Abort()
System.Net Error: 0 : [0280] Exception in HttpWebRequest#13062350:: - The operation has timed out.
System.Net Error: 0 : [0280] Exception in HttpWebRequest#13062350::GetResponse - The operation has timed out.
System.Net Error: 0 : [0280] Exception in AppDomain#12036987::UnhandledException
Handler - The operation has timed out.   at System.Net.HttpWebRequest.GetResponse()

Answer 1

事实证明，我需要做的就是在 request.GetResponse() 调用之前添加以下行

request.ServicePoint.Expect100Continue = false;
request.ProtocolVersion = HttpVersion.Version11;

希望我花在这上面的时间能帮助其他人更快地解决问题。