Dumping HTTP Response with Cookies

JSP Tutorials - Herong's Tutorial Examples

∟Dumping HTTP Response with Cookies

This section provides a tutorial example on how to dump the entire HTTP response received from the JSP server to review cookies included in the HTTP headers.

For those of you who want to know how cookies are included in the HTTP response, I have the following Java program to dump HTTP response, HttpRequestGet.java:

/* HttpRequestGet.java
 * Copyright (c) 2002 HerongYang.com. All Rights Reserved.
 */
import java.io.*;
import java.net.*;
public class HttpRequestGet {
   public static void main(String[] args) {
      String path = "/index.html";
      int port = 80;
      String host = "localhost";
      if (args.length > 0) path = args[0];
      if (args.length > 1) port
         = Integer.valueOf(args[1]).intValue();
      if (args.length > 2) host = args[2];
      String result = "";
      try {
         Socket c = new Socket(host,port);
         BufferedWriter w = new BufferedWriter(new OutputStreamWriter(
            c.getOutputStream()));
         BufferedReader r = new BufferedReader(new InputStreamReader(
            c.getInputStream()));
         String m = "GET "+ path + " HTTP/1.0";
         w.write(m,0,m.length());
         w.newLine();
         w.newLine();
         w.flush();
         while ((m=r.readLine())!= null) {
            System.out.println(m);
         }
         w.close();
         r.close();
         c.close();
      } catch (IOException e) {
         System.err.println(e.toString());
      }
   }
}

Here is simple JSP page that set cookies in different ways, CookieDump.jspx:

<?xml version="1.0"?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.3">
<!--
 - CookieDump.jspx
 - Copyright (c) 2006 HerongYang.com. All Rights Reserved.
-->
<jsp:directive.page contentType="text/html"/>
<html><body>
<p>
<jsp:directive.page import="javax.servlet.http.Cookie"/>
<jsp:scriptlet><![CDATA[
// Setting a temporary cookie
   out.println("<b>Temporary cookie:</b><br/>");
   Cookie c = new Cookie("Language","English");
   response.addCookie(c);
   out.println("Name: "+c.getName()+"<br/>");
   out.println("Value: "+c.getValue()+"<br/>");
   out.println("Domain: "+c.getDomain()+"<br/>");
   out.println("Path: "+c.getPath()+"<br/>");
   out.println("MaxAge: "+c.getMaxAge()+"<br/>");
   out.println("Version: "+c.getVersion()+"<br/>");

// Setting a persisted cookie
   out.println("<b>Persisted cookie:</b><br/>");
   c = new Cookie("User","Herong Yang");
   c.setMaxAge(3*24*60*60);
   response.addCookie(c);
   out.println("Name: "+c.getName()+"<br/>");
   out.println("Value: "+c.getValue()+"<br/>");
   out.println("Domain: "+c.getDomain()+"<br/>");
   out.println("Path: "+c.getPath()+"<br/>");
   out.println("MaxAge: "+c.getMaxAge()+"<br/>");
   out.println("Version: "+c.getVersion()+"<br/>");

// Setting a temporary cookie with specified properties
   out.println("<b>Temporary cookie with domain defined:</b><br/>");
   c = new Cookie("Password","top_secret");
   c.setDomain("some.com");
   response.addCookie(c);
   out.println("Name: "+c.getName()+"<br/>");
   out.println("Value: "+c.getValue()+"<br/>");
   out.println("Domain: "+c.getDomain()+"<br/>");
   out.println("Path: "+c.getPath()+"<br/>");
   out.println("MaxAge: "+c.getMaxAge()+"<br/>");
   out.println("Version: "+c.getVersion()+"<br/>");

// Setting a persisted cookie with specified properties
   out.println("<b>Persisted cookie with domain defined:</b><br/>");
   c = new Cookie("Login","herong_yang");
   c.setMaxAge(3*24*60*60);
   c.setDomain("some.com");
   response.addCookie(c);
   out.println("Name: "+c.getName()+"<br/>");
   out.println("Value: "+c.getValue()+"<br/>");
   out.println("Domain: "+c.getDomain()+"<br/>");
   out.println("Path: "+c.getPath()+"<br/>");
   out.println("MaxAge: "+c.getMaxAge()+"<br/>");
   out.println("Version: "+c.getVersion()+"<br/>");
]]></jsp:scriptlet>
</p>
</body></html>
</jsp:root>

Now install CookieDump.jspx in tomcat default application directory. Then run HttpRequestGet.java:

herong> java HttpRequestGet /CookieDump.jspx 8080

HTTP/1.1 200 OK
Set-Cookie: JSESSIONID=57D1A62F468EEB99E759D4D4F38632B3; Path=/; HttpOnly
Set-Cookie: Language=English
Set-Cookie: User=HerongYang; Max-Age=259200; Expires=timestamp
Set-Cookie: Password=top_secret; Domain=some.com
Set-Cookie: Login=herong_yang; Max-Age=259200; Expires=timestamp; ...
Content-Type: text/html;charset=UTF-8
Content-Length: 664
Connection: close

<html><body><p><b>Temporary cookie:</b><br/>
Name: Language<br/>
Value: English<br/>
Domain: null<br/>
Path: null<br/>
MaxAge: -1<br/>
Version: 0<br/>
<b>Persisted cookie:</b><br/>
Name: User<br/>
Value: HerongYang<br/>
Domain: null<br/>
Path: null<br/>
MaxAge: 259200<br/>
Version: 0<br/>
<b>Temporary cookie with domain defined:</b><br/>
Name: Password<br/>
Value: top_secret<br/>
Domain: some.com<br/>
Path: null<br/>
MaxAge: -1<br/>
Version: 0<br/>
<b>Persisted cookie with domain defined:</b><br/>
Name: Login<br/>
Value: herong_yang<br/>
Domain: some.com<br/>
Path: null<br/>
MaxAge: 259200<br/>
Version: 0<br/>
</p></body></html>

As you can see, these are 5 cookies included in the HTTP response header section. The first one is added by the JSP server. The other 4 are added by my JSP page.