基于 C# 套接字的 HTTP

Question

我正在尝试通过 C# 套接字发送 HTTP 请求并从服务器接收响应，而且我是这种语言的新手。

我写了以下代码（IP 解析正确）：

IPEndPoint RHost = new IPEndPoint(IP, Port);
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Connect(RHost);

String HTTPRequestHeaders_String = "GET ?q=fdgdfg HTTP/1.0
Host: google.com
Keep-Alive: 300
Connection: Keep-Alive
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.205 Safari/534.16
Referer: http://google.com/";

MessageBox.Show(HTTPRequestHeaders_String, "Request");

byte[] HTTPRequestHeaders = System.Text.Encoding.ASCII.GetBytes(HTTPRequestHeaders_String);
socket.Send(HTTPRequestHeaders, SocketFlags.None);

String Response = "";
byte[] buffer = new byte[(int) socket.ReceiveBufferSize];

int bytes;
do
{
    // On this lane program stops to react
    bytes = socket.Receive(buffer);
    // This line cannot be reached, tested with breakpoint
    Response += Encoding.ASCII.GetString(buffer, 0, bytes);
}
while (bytes >= 0);

MessageBox.Show(Response, "Response");

我做错了什么？我只需要加载页面的完整 HTML，或者至少加载响应中的几个字符（我什至不能这样做）。

Answer 1

如果您想原始执行此操作，我建议您查看协议本身， http ://www.w3.org/Protocols/HTTP/1.0/spec.html#Request

并尝试发送 CRLF 来终止请求;)

Answer 2

var webClient = new WebClient();
webClient.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
Stream responseStream = webClient.OpenRead("http://www.google.com");
if (responseStream != null)
{
   var responseReader = new StreamReader(responseStream);
   string response = responseReader.ReadToEnd();
   MessageBox.Show(response);
}

Answer 3

我发现 Mentalis 代理对于理解套接字级别的 Http 请求/响应周期非常有帮助： http://www.mentalis.org/soft/projects/proxy/

Answer 4

有 TcpClient 类，一方面允许您完全控制请求（您将请求正文创建为字符串），另一方面比低级套接字使用起来简单得多。

http://msdn.microsoft.com/en-us /library/system.net.sockets.tcpclient.aspx