HTTP Proxy in Java

[Rahul Dabas]

Hi,
I am supposed to make a HTTP proxy for Get, Post, Head method.
I din know where to start.
SO i looked up online and found one piece here one there and tried to make something
Here is the code i got online:

package MyProxy;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;


public class TrialProxyServer 
{
	public static final int portNumber = 5555;  
	/**
	 * @param args
	 */

	public static void main(String[] args)
	{
		TrialProxyServer trialProxyServer = new TrialProxyServer();
		trialProxyServer.start();
	}  
	
	public void start()
	{
		System.out.println("\tStarting the MyProxyServer on port: "+portNumber);  
	
		try 
		{  
			ServerSocket serverSocket = new ServerSocket(TrialProxyServer.portNumber,1);  
			byte[] buffer = new byte[1000000];
	
			while(true)
			{  
				//System.out.println("Inside while loop ");  
				
				// Client Socket and stream reader
				Socket clientSocket = serverSocket.accept();
				InputStream inCStream = clientSocket.getInputStream();
				//System.out.println("Connection to MyProxyServer is "+clientSocket.isConnected());
				
				// Read the request from Browser- store in buffer and display on console.				
				int n = inCStream.read(buffer);
				String browserRequest = new String(buffer, 0, n);
				System.out.println("\n\n  Client Request: \n"+browserRequest);
				
				// Extract the host name from client request.
				int first = browserRequest.indexOf("Host: ") + 6;
				int last = browserRequest.indexOf('\n', first);
				String hostName = browserRequest.substring(first, last-1);
				System.out.println("Now connecting to: " + hostName);
				
				
				// Forward the request from Proxy to Server
				Socket hostSocket = new Socket(hostName, 80);
				OutputStream outCStream = hostSocket.getOutputStream();
				System.out.println("Forwarding request to server");
				outCStream.write(buffer, 0, n);
				outCStream.flush();
				
				
				// Server stream readers
				InputStream inSStream = hostSocket.getInputStream();
				OutputStream outSStream = clientSocket.getOutputStream();
				
				// Getting response from Server to Browser
				System.out.println("Forwarding response from server");
				int m=0;
				while(m != -1) 
				{
					m = inSStream.read(buffer);
					System.out.println("Receiving " + m + " bytes");
						outSStream.write(buffer, 0, m);					
				}
				
				
				outSStream.flush();
				hostSocket.close();
				clientSocket.close();
				System.out.println("The End of communication");
				
				
			}
		} 
		
		catch (IOException e) 
		{  
			// TODO Auto-generated catch block  
			e.printStackTrace();  
		}  
	}  
}  

T problem is when I am getting response from server. My while loops keep going on forever and finally would get -1 as response size and proxy will die.
I don't want that to happen.
Even the browser wont get the whole page. Just about 1/10th maybe.

It is a wrong method to get response from server.
I am a loooong way from finish and submition date is day after.
Pleasssee help someone...


Thanks a lot in advance.

[Paul Clapham]

Hello, Rasul, welcome to the Ranch.

I put your code into the "Code" tags so it's easier to read. Hopefully that will cause somebody to take a look at it.