自己写一个简单的Web服务器，对加深理解Http协议有很好的帮助，下面就看一下一个基于TcpListener的Web服务器：
class Program { static void Main(string[] args) { IPAddress address = IPAddress.Loopback; IPEndPoint endPoint = new IPEndPoint(address, 49152); TcpListener newserver = new TcpListener(endPoint); newserver.Start(); Console.WriteLine("开始监听......"); while (true) { TcpClient newclient = newserver.AcceptTcpClient(); Console.WriteLine("已经建立连接"); NetworkStream ns = newclient.GetStream(); System.Text.Encoding utf8 = System.Text.Encoding.UTF8; byte[] request=new byte[4096]; int lehgth = ns.Read(request, 0, 4096); string requestString = utf8.GetString(request); Console.WriteLine(requestString); string statusLine = "HTTP/1.1 200 OK "; byte[] statusLineBytes = utf8.GetBytes(statusLine); string responseBody = "<html><head><body><h1>hello world</h1></body></head></html>"; byte[] responseBodyBytes = utf8.GetBytes(responseBody); //回应头部分 string responseHeader = string.Format("Content-Type:text/html;charset=UTF-8 Content-Length:{0} ",responseBody.Length); byte[] responseHeaderBytes = utf8.GetBytes(responseHeader); ns.Write(statusLineBytes, 0, statusLineBytes.Length); ns.Write(responseHeaderBytes, 0, responseHeaderBytes.Length); ns.Write(new byte[] { 13, 10 }, 0, 2); ns.Write(responseBodyBytes, 0, responseBodyBytes.Length); newclient.Close(); if (Console.KeyAvailable) break; } newserver.Stop(); }
运行程序，然后打开浏览器，在浏览器窗口中输入服务器的地址：http://localhost:49152，这时就回看到服务器返回的数据。