Long delay [~ 1s] between the browser trying to connect and Socket.Accept ()

Question

Long delay [~ 1s] between the browser trying to connect and Socket.Accept ()

Problem summary: I am currently playing with writing custom applications for http servers. I found out that when any web browser connected to my server application will have 0.5-1 seconds of “latency” (according to Google Chrome) before the request is processed [which will take milliseconds]

In the end, I tried to create a dummy program to identify the problem:

using System.Text;
using System.Net;
using System.Net.Sockets;

namespace SlowHTTPServer 
{ 
    class FailServer 
    {
        static void Main() 
        {
            //Create socket object, bind it, listen to 80
            Socket listenerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            listenerSocket.Bind(new IPEndPoint(IPAddress.Any, 80));
            listenerSocket.Listen(64);

            while (true)
            {
                Socket clientConn = listenerSocket.Accept();            //Accept
                System.DateTime startTime = System.DateTime.Now;

                byte[] buffer = new byte[1024];                         //Request header buffer
                clientConn.Receive(buffer);                             //Recieve request header

                string reqHeader = Encoding.ASCII.GetString(buffer);    //Get the string version of it
                                                                        //We completely ignore most of the request header lol

                //Normally i'd send a response header but...
                if (reqHeader.IndexOf("script1") != -1)                 //script1.js - document.title='hai dere'
                    clientConn.Send(Encoding.ASCII.GetBytes("document.title='hai dere';"));
                else if (reqHeader.IndexOf("script2") != -1)            //script2.js - Get a pretty background color onload
                    clientConn.Send(Encoding.ASCII.GetBytes("window.onload=function(){document.body.style.backgroundColor='#FF99FF';};"));
                else if (reqHeader.IndexOf("iframe") != -1)             //Noob iframe that just has text.
                    clientConn.Send(Encoding.ASCII.GetBytes("blargh zargh nargh dargh pikachu tangerine zombie destroy annihilate"));
                else                                                    //hai dere is the body.innerHTML, load script1.js and script2.js
                    clientConn.Send(Encoding.ASCII.GetBytes("<html><head><script src='script1.js'></script><script src='script2.js'></script></head><body>mainPage<iframe src='iframe.html'>u no haz iframe</iframe></body></html>"));

                clientConn.Close();                                     //Close the connection to client.  We've done such a good job!

                System.Console.WriteLine((System.DateTime.Now - startTime).TotalMilliseconds);
            }
        }
    }
}

... , + script + iframe - 2- [ localhost localhost, Windows + ], , Apache, [ , ] 100 .

, , , , http-. , .

, 30 + JavaScript script, 20 [ , < 10 kb]

script, , , , 1-10 , , http -, [ , ?]

. .

: - "" , , , , . - 80, , http://127.0.0.1/ http://localhost/

:
Chrome,

:
, / ... , 1 .

using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace SlowSocketAccept
{
    class Program
    {
        static DateTime connectionBeginTime;
        static bool listening = false;
        static void Main(string[] args)
        {

            new Thread(ClientThread).Start();
            Socket listenerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            listenerSocket.Bind(new IPEndPoint(IPAddress.Any, 80));
            listenerSocket.Listen(80);

            listening = true;
            Socket newConn = listenerSocket.Accept();
            byte[] reqHeader = new byte[1024];
            newConn.Receive(reqHeader);
            newConn.Send(Encoding.ASCII.GetBytes("Response Header\r\n\r\nContent"));
            newConn.Close();

            Console.WriteLine("Elapsed time: {0} ms", (DateTime.Now - connectionBeginTime).TotalMilliseconds);

        }
        static void ClientThread()
        {
            while (listening == false) ; //Busy wait, whatever it an example
            System.Threading.Thread.Sleep(10); //Wait for accept to be called =/

            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            connectionBeginTime = DateTime.Now;
            s.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 80));
            s.Send(Encoding.ASCII.GetBytes("Request Header"));
            byte[] response = new byte[1024];
            s.Receive(response);
        }
    }
}

[a b - ]
a) 'b'
b) , A , , a) , 80, , B, b) , 127.0.0.1:80 [localhost: 80]
a) b) [ ]
a) , [ + ]
a)

1 =/

+3

javascript http c# browser sockets

Warty 13 . '10 11:35

1

cHao · Accepted Answer · 2010-08-13T11:55:03+0000

Content-Length , HTTP 1.0, - , , ( ).

, Content-Length "Connection: close".

, . .net(, , , ), , reset. Close - ; Shutdown - , .

Long delay [~ 1s] between the browser trying to connect and Socket.Accept ()

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