EchoServlet.java

package org.browsermob.proxy;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

public class EchoServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setStatus(200);

        PrintWriter writer = resp.getWriter();

        writer.println("Method: " + req.getMethod());

        writer.println("Request Headers:");
        Enumeration headerNames = req.getHeaderNames();
        while (headerNames.hasMoreElements()) {
            String hdr = (String) headerNames.nextElement();
            Enumeration headers = req.getHeaders(hdr);
            while (headers.hasMoreElements()) {
                String val  = (String) headers.nextElement();
                writer.println(hdr + ": " + val);
            }
        }

        writer.close();
    }
}