package devmanuals;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

public class GetRequestHeader extends HttpServlet {
	public void doGet(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		res.setContentType("text/html");
		PrintWriter out = res.getWriter();
		/* Obtain all header names as an Enumeration */
		Enumeration hnames = req.getHeaderNames();
		out.println("<H3>The request headers are:</H3>");
		/* Check for more elements in the Enumeration */
		while (hnames.hasMoreElements()) {
			/* Obtain the header name */
			String hname = (String) hnames.nextElement();
			/*
			 * Obtain all header values as an Enumeration corresponding to the
			 * header name passed as method parameter
			 */
			Enumeration hvalues = req.getHeaders(hname);
			out.println("<BR>");
			if (hvalues != null) {
				/*
				 * Check for more elements in the Enumeration
				 */
				while (hvalues.hasMoreElements()) {
					/* Obtain the header value */
					String hvalue = (String) hvalues.nextElement();
					/*
					 * Send the header name and value as response
					 */
					out.println(hname + ": " + hvalue);
				}
			}
		}
	}
}