Hello,
I need to write a servlet that accepts GET and POST requests and forwards 
the request to the URL in the request-parameter "url".

A very simple implementation looks like this:

---
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ProxyServlet extends HttpServlet
{
	public void doGet(HttpServletRequest request, HttpServletResponse 
response) throws IOException, ServletException
	{
		doRequest(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse 
response) throws IOException, ServletException
	{
		doRequest(request, response);
	}

	public void doRequest(HttpServletRequest request, 
HttpServletResponse response) throws IOException, ServletException, 
MalformedURLException
	{
		URL url = new URL(request.getParameter("url"));
		URLConnection con = url.openConnection();
		InputStream is = con.getInputStream();

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

		int c;
		while ((c = is.read()) != -1)
		{
			out.write(c);
		}

		is.close();
		
		return;
	}
}
---

A call to "http://www.domain.com/servlet/ProxyServlet?
url=http://www.other_domain.com/path/to/webpage.htm" results in a call 
to "http://www.other_domain.com/path/to/webpage.htm" by the ProxyServlet. 
The resulting page is then copied in the HttpServletResponse-object of the 
ProxyServlet (and send to the calling application, for instance a browser 
window). Of course, I would like to forward the header-parameters, request-
parameters etc. as well (which is not done in my code).

Thus, my questions are:
Is there a class which does this already? It is hard to believe this has 
not been done before.
What is this called? A ProxyServlet, TunnelServlet, GatewayServlet or even 
something else?

Thanks,
Joeri