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POUnderstanding Javas HttpSession
 

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    <p>I have a little problem with HttpSession. I use jetty 8 and try to implement an embedded web server.</p> <p>For testing purpose i have created two servlets:</p> <ul> <li>FileServlet: It simply handles HTTP GET for static content, like index.html, css and other static files and prints the current session id on the console:</li> </ul> <blockquote> <p>System.out.println("File session: "+request.getSession(true).getId() + " path "+request.getPathInfo());</p> </blockquote> <ul> <li>TestServlet: Does nothing, it simply prints the current session id on the console on a doGet(...)</li> </ul> <blockquote> <p>System.out.println("Test session: "+request.getSession(true).getId() + " path "+request.getPathInfo());</p> </blockquote> <p>As far as i know the Servlets must be part of the same ServletContext to handle Sessions correctly. So i implement it programmatically this way:</p> <pre><code>Server server = new Server(8081); ServletContextHandler servletContext = new ServletContextHandler(ServletContextHandler.SESSIONS); servletContext.setContextPath("/"); servletContext.addServlet(new ServletHolder(new FileServlet()),"/*"); servletContext.addServlet(new ServletHolder( new TestServlet()),"/servlets/test"); server.setHandler(servletContext); </code></pre> <p>Now I start my web-browser (Chrome btw.) clear browsers cookies and browsers chache and load my test site <a href="http://localhost:8081/index.html" rel="nofollow">http://localhost:8081/index.html</a> which will also request to load other static files like css and js.</p> <p>So now i get this output:</p> <pre><code>File session: ok49uty1mshn1fnhyle9ojh3n path /index.html File session: 1fuxdd50woxwv1gl9r96dfdxgl path /css/style.css File session: 1f6m5dkht4xja5ryj7dgd93wu path /css/Loading.css File session: 1qizt3gnyy58uj0u46kofbxdf path /css/photo.css File session: ikzpmgyew49uwxlnt8lr839m path /css/Login.css File session: pg6p843xuqak1uwcc68q8wnxx path /js/script.nocache.js File session: 1uv2jmvpu5u6s127rpc01ef8 path /js/script2.js </code></pre> <p>After index.html has been loaded and every other resource that is embedded in index.html (css and js) i call <a href="http://localhost:8081/servlets/test" rel="nofollow">http://localhost:8081/servlets/test</a> and i see this output:</p> <pre><code>Test session: 1uv2jmvpu5u6s127rpc01ef8 path /servlets/test </code></pre> <p>So it seems to me that it takes some time to establish a session and i am wondering why and how to let the first session that has been created by the HTTP GET of /index.html be the session for every futher server interaction. Its very strange.</p> <p>I also make a second experiment: As a said before i cleared the browsers cache and cookies before loading /index.html. This time i reload the page without clearing the cache and cookies, and now it works correctly or in other words, how i expect to work:</p> <pre><code>File session: 1uv2jmvpu5u6s127rpc01ef8 path /index.html File session: 1uv2jmvpu5u6s127rpc01ef8 path /css/style.css File session: 1uv2jmvpu5u6s127rpc01ef8 path /css/Loading.css File session: 1uv2jmvpu5u6s127rpc01ef8 path /css/photo.css File session: 1uv2jmvpu5u6s127rpc01ef8 path /css/Login.css File session: 1uv2jmvpu5u6s127rpc01ef8 path /js/script.nocache.js File session: 1uv2jmvpu5u6s127rpc01ef8 path /js/script2.js </code></pre> <p>And also /servlets/test have the same session:</p> <pre><code>Test session: 1uv2jmvpu5u6s127rpc01ef8 path /servlets/test </code></pre> <p>EDIT: i understand that my browser doesnt wait until the index.html is loaded completly and start to load the css and js in the meantime... But I really need to be able to determine from the first HTTP GET the "real" session for some security reasons. Any suggestions?</p>
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    1. COTo be 100% sure of what's happening here, you should get a dump of the HTTP headers each way. Something like wireshark can do that for you, or you can look at in your browser (using something like [LiveHttpHeaders](http://livehttpheaders.mozdev.org/) for Firefox, or [net-internals](http://www.google.com/support/forum/p/Chrome/thread?tid=2f76303d4e166cdd&hl=en) for Chrome. You need to get a true picture of what's passing between the server+client in order to see when cookies are being set/sent, rather than guessing from your server logs.
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