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ShowRequestHeaders.java  Servlet that shows all request headers sent by browser in current request. 

package cwp;

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

/** Shows all the request headers sent on this request.
 *

 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  .
 *  May be freely used or adapted.
 */

public class ShowRequestHeaders extends HttpServlet {
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Servlet Example: Showing Request Headers";
    out.println(ServletUtilities.headWithTitle(title) +
                "\n" +
                "

" + title + "

\n" +
                "Request Method: " +
                request.getMethod() + "
\n" +
                "Request URI: " +
                request.getRequestURI() + "
\n" +
                "Request Protocol: " +
                request.getProtocol() + "

\n" +
                "\n" +
                "\n" +
                "

Header Name

Header Value");
    Enumeration headerNames = request.getHeaderNames();
    while(headerNames.hasMoreElements()) {
      String headerName = (String)headerNames.nextElement();
      out.println("

" + headerName);
      out.println("

" + request.getHeader(headerName));
    }
    out.println("

\n");
  }

  /** Let the same servlet handle both GET and POST. */

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