1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Runtime.InteropServices;
6 using System.IO;
7 using System.Diagnostics;
8 using System.Net;
9 using System.Net.Sockets;
10
11 namespace ConsoleApplication1
12 {
13 class Program
14 {
15 static void Main(string[] args)
16 {
17 var host = "www.wikipedia.org";
18 var resource = "/";
19 var result = GetResource(host, resource);
20 File.WriteAllText("temp.txt",result);
21 Process.Start("temp.txt");
22 }
23
24 private static string GetResource(string host, string resource)
25 {
26 var hostEntry = Dns.GetHostEntry(host);
27 var socket = CreateSocket(hostEntry);
28 SendRequest(socket, host, resource);
29 return GetResponse(socket);
30 }
31
32 private static Socket CreateSocket(IPHostEntry hostEntry)
33 {
34 const int httpPort = 80;
35 foreach (var address in hostEntry.AddressList)
36 {
37 var endPoint = new IPEndPoint(address, httpPort);
38 var socket = new Socket(
39 endPoint.AddressFamily,
40 SocketType.Stream,
41 ProtocolType.Tcp);
42 socket.Connect(endPoint);
43 if (socket.Connected)
44 {
45 return socket;
46 }
47 }
48 return null;
49 }
50
51 private static void SendRequest(Socket socket, string host, string resource)
52 {
53 var requestMessage = String.Format(
54 "GET {0} HTTP/1.1\r\n" +
55 "HOST: {1} \r\n" +
56 "\r\n",
57 resource,host
58 );
59 var requestBytes = Encoding.ASCII.GetBytes(requestMessage);
60 socket.Send(requestBytes);
61 }
62
63 private static string GetResponse(Socket socket)
64 {
65 int bytes = 0;
66 byte[] buffer = new byte[256];
67 var result = new StringBuilder();
68
69 do
70 {
71 bytes = socket.Receive(buffer);
72 result.Append(Encoding.ASCII.GetString(buffer,0,bytes));
73 } while (bytes > 0);
74
75 return result.ToString();
76 }
77 }
78 }
