Java HTTP proxy server

I need to implement an HTTP proxy server application that will proxy requests from multiple clients to remote servers

Here are the steps:

>Client forwards request to proxy > proxy forwards request to server > server returns request to proxy > proxy returns request to client

I just don't know how I should implement this agent My first idea is to implement a Tomcat application using Jersey / Apache httpclient to forward the request to the remote server and return the response to the client?

Is there a better way to implement such a proxy server?

The agent will need to handle multiple threads

Solution

You can't implement it as a servlet, and there's no reason to use any form of HTTP client

A featureless proxy server is a very simple thing:

>Accept a connection and start a thread. > Read request from client to blank line. > Extract the get or connect command or any of its contents and connect to the specified host. > If it fails, send back an appropriate HTTP error response, close the socket and forget it. > Otherwise, start two threads to copy bytes, one in each direction Nothing fancy, just

while ((count = in.read(buffer)) > 0)
{
    out.write(buffer,count);
}

>When one socket reads EOS, please close the other socket for output and exit the thread that gets EOS. > If the socket as the EOS source has closed the output, close it

Or use Apache squid