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Print Request Headers for a Servlet

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; public class MyServlet extends HttpServlet {   public void doGet(HttpServletRequest req, HttpServletResponse res)                                throws ServletException, IOException {     res.setContentType("text/plain");     PrintWriter out = res.getWriter();     out.println("Request Headers:");     out.println();     Enumeration names = req.getHeaderNames();     while (names.hasMoreElements()) {       String name = (String) names.nextElement();       Enumeration values = req.getHeaders(name);  // support multiple values       if (values != null) {         while (values.hasMoreElements()) {           String value = (String) values.nextElement();           out.println(name + ": " + value);         }       }     }   } } <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE web-app     PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"     "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd"> <web-app>     <servlet><servlet-name>MyServletName</servlet-name>              <servlet-class>MyServlet</servlet-class>     </servlet>          <servlet-mapping><servlet-name>MyServletName</servlet-name>         <url-pattern>/index.html</url-pattern>     </servlet-mapping> </web-app>