Print Request Headers for a Servlet : Request « Servlet « Java Tutorial

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 {
    PrintWriter out = res.getWriter();

    out.println("Request Headers:");
    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"

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25.12.1.Print Request Headers for a Servlet
25.12.2.Get Servlet Request Parameter
25.12.3.Get Remote User and display welcome message
25.12.4.Get Users IP Address
25.12.5.Get Remote Host from Servlet Request
25.12.6.Request parsing and encoding utility methods