HTTP protocol header information and subject identification

The HTTP protocol header information and the body are separated using a blank line. What is this, a blank line? Simply put, that is, \r\n\r\n.

So the regression of the server data \r\n\r\n Result separation, one is the header information. It is the text of a message.

C # For example, the following code:

Using system;using system.collections.generic;using system.componentmodel;using system.data;using System.Drawing; Using system.linq;using system.text;using system.windows.forms;using system.text.regularexpressions;using System.IO ; namespace socket{public    partial class Form1:form    {public        Form1 ()        {            InitializeComponent ();        }        private void Button1_Click (object sender, EventArgs e)        {            int port = +;            Getsocket GS = new Getsocket ();            string result = Gs. Socketsendreceive ("www.baidu.com", port);            Regex regex = new Regex ("\r\n\r\n");//with CJLOVEFL cut            string[] bit = regex. Split (result);            MessageBox.Show (bit[1]);            StreamWriter SW = new StreamWriter ("D:\\1.txt");            Sw. Write (result);            Sw. Close ();}}    }

Result is the information returned by the server that contains the header and body.

Among the Getsocket classes are as follows:

Using system;using system.text;using system.io;using system.net;using system.net.sockets;using System.Windows.Forms;        Using System.text.regularexpressions;public class getsocket{public Socket connectsocket (string server, int port) {        Socket s = null;        Iphostentry hostentry = null;        Get host related information.        Hostentry = dns.gethostentry (server); Loop through the AddressList to obtain the supported addressfamily.        This was to avoid//a exception that occurs when the host IP Address isn't compatible with the address family        (typical in the IPv6 case).            foreach (IPAddress address in hostentry.addresslist) {IPEndPoint ipe = new IPEndPoint (address, port); Socket tempsocket = new socket (ipe.            AddressFamily, SocketType.Stream, protocoltype.tcp);            Tempsocket.connect (IPE);                if (tempsocket.connected) {s = tempsocket; Break           } else {continue;    }} return S;    }//This method requests the home page content for the specified server.  public string socketsendreceive (string server, int port) {string request = "Get/http/1.0\r\nhost:" + server + "\r\nuser-agent:mozilla/5.0 (Windows NT 6.1;        rv:29.0) gecko/20100101 firefox/29.0\r\nconnection:keep-alive\r\n\r\n ";        byte[] BytesSent = Encoding.ASCII.GetBytes (request);        byte[] bytesreceived = new byte[256];        Create a socket connection with the specified server and port.        Socket s = connectsocket (server, port);        if (s = = null) return ("Connection failed");        Send request to the server.        S.send (bytessent, bytessent.length, 0);        Receive the server home page content.        int bytes = 0;        String page = "Default HTML page on" + server + ": \ r \ n"; The following would block until Te page is transmitted.            do {bytes = s.receive (bytesreceived, bytesreceived.length, 0);        Page =page+ Encoding.ASCII.GetString (bytesreceived, 0, bytes);        } while (bytes > 0);    return page;        }/* public static void Main (string[] args) {string host = "http://www.baidu.com";        int port = 80; if (args. Length = = 0)//If No server name is passed as argument to this program and//use of the current host Nam            e as the default.        Host = Dns.gethostname ();        else host = Args[0];        string result = Socketsendreceive ("www.goodjobs.cn", port);        StreamWriter SW = new StreamWriter ("D:\\1.txt");        string w = ""; Sw.        Write (result); Sw.    Close (); }     * */}

Test success!

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HTTP protocol header information and subject identification