c# - 如何使用 TcpClient 向网站发出请求

Question

我正在尝试使用 TcpClient 向网站发出请求，但我无法让它工作。首先，我与 remoteHost 建立连接并写入 requestStr 变量中的请求 header 。之后我从远程流中读取并期望得到响应，但我什么也没得到。我还使用 while 循环中的代码从浏览器接收请求 header ，该浏览器使用我的应用程序作为代理并且工作正常。

Eol 变量是\r\n。

requestStr 变量是:

GET http://steam.com/ HTTP/1.1
Host: steam.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: nl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive

代码片段:

TcpClient remoteClient = new TcpClient(request.GetRemoteHost(), 80);
byte[] remoteRequest = Encoding.UTF8.GetBytes(requestStr);
NetworkStream remoteStream = remoteClient.GetStream();
remoteStream.Write(remoteRequest, 0, remoteRequest.Length);
remoteStream.Flush();

int j;
string remoteStr = "";
byte[] remoteBuffer = new byte[App.BufferSize];
recvRequest = true;
while (recvRequest && (j = remoteStream.Read(remoteBuffer, 0, remoteBuffer.Length)) != 0) {
    string receivedData = Encoding.ASCII.GetString(remoteBuffer, 0, j);

    if (receivedData.IndexOf(Eol) < 0) {
        remoteStr += receivedData;
    } else {
        remoteStr += receivedData.Substring(0, receivedData.IndexOf(Eol + Eol));
        recvRequest = false;
    }
}

MessageBox.Show(remoteStr);

Answer 1

查看您发送的请求，您不包括 a blank line (仍然以\r\n 结尾)在它的末尾。这标志着 header 的结尾，因此服务器知道它已经收到所有 header 并可以处理请求。