This is a HTTP proxy server written in Java. Although this was an assignment in my EECS 325 Networking class, this is not the proxy I wrote for that class. This is a proxy I have written since then, with the benefit of much more knowledge about HTTP.
In my original proxy, I did not bother understanding that there are several different ways to determine the length of a message body, and thus know when to stop forwarding a request or response body. So I simply wrote a thread that would forward bytes until a connection closed, or until I killed it because I had received a new request. That strategy is perhaps easier, but not a good idea at all.
In this proxy, I fully parse the request, determine what type of message body it uses, and forward it using a method that understands that transfer encoding. That way, the forwarding always stops at the correct time, and I can reuse client connections properly.
Build with javac, (make sure you are aware of the classpath, io.brennan.proxy). Run with
java io.brennan.proxy.Main [portnum].