url: bypass.jsp?http://some.url

bypass.jsp

<%@page session="false"%>
<%@page import="java.net.*,java.io.*"%>
<%
	try {
		String reqUrl = request.getQueryString();
		
		URL url = new URL(reqUrl);
		HttpURLConnection con = (HttpURLConnection) url.openConnection();
		con.setDoOutput(true);
		con.setRequestMethod(request.getMethod());
		int clength = request.getContentLength();
		if (clength > 0) {
			con.setDoInput(true);
			byte[] idata = new byte[clength];
			request.getInputStream().read(idata, 0, clength);
			con.getOutputStream().write(idata, 0, clength);
		}
		response.setContentType(con.getContentType());
		
		BufferedReader rd = new BufferedReader(new InputStreamReader(
		con.getInputStream()));
		String line;
		while ((line = rd.readLine()) != null) {
			out.println(line);
		}
		rd.close();
		
	} catch (Exception e) {
		System.out.println(e.getMessage());
		response.setStatus(500);
	}
%>