package net.mybluemix.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.util.Enumeration;

/**
 * Servlet implementation class SimpleServlet
 */
@WebServlet("/SimpleServlet")
public class SimpleServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        String fullMessage = "Hello World from Gearoid!\n";
        System.out.println(fullMessage);
        Enumeration headerNames = request.getHeaderNames();
		while (headerNames.hasMoreElements()) {
			String key = (String) headerNames.nextElement();
			String value = request.getHeader(key);
			fullMessage += "Header Key: " + key + ", Header Value: " + value;
			System.out.println("Header Key: " + key + ", Header Value: " + value);
		}
		response.getWriter().print(fullMessage);
    }
	
	/**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        Enumeration headerNames = request.getHeaderNames();
		while (headerNames.hasMoreElements()) {
			String key = (String) headerNames.nextElement();
			String value = request.getHeader(key);
			System.out.println("Header Key: " + key + ", Header Value: " + value);
		}
    }

}

package net.mybluemix.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.util.Enumeration;

/**
 * Servlet implementation class SimpleServlet
 */
@WebServlet("/SimpleServlet")
public class SimpleServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        String fullMessage = "Hello World from Gearoid!\n";
        System.out.println(fullMessage);
        Enumeration headerNames = request.getHeaderNames();
		while (headerNames.hasMoreElements()) {
			String key = (String) headerNames.nextElement();
			String value = request.getHeader(key);
			fullMessage += "Header Key: " + key + ", Header Value: " + value;
			System.out.println("Header Key: " + key + ", Header Value: " + value);
		}
		response.getWriter().print(fullMessage);
    }
	
	/**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        Enumeration headerNames = request.getHeaderNames();
        while (headerNames.hasMoreElements()) {
	        String key = (String) headerNames.nextElement();
	        String value = request.getHeader(key);
	        System.out.println("Header Key: " + key + ", Header Value: " + value);
    	}
        StringBuffer jb = new StringBuffer();
        String line = null;
        try {
            BufferedReader reader = request.getReader();
            while ((line = reader.readLine()) != null)
                jb.append(line);
        } catch (Exception e) { /*report an error*/ }
        System.out.println(jb.toString());
    }

}

Update SimpleServlet.java