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    <p>This is typically an unrecoverable error which is usually best to be displayed as a standalone error page. Configure the webapplication to display a customized <code>4nn/5nn</code> error page and setup jQuery as follows:</p> <pre><code>$(document).ready(function() { $.ajaxSetup({ error: handleXhrError }); }); function handleXhrError(xhr) { document.open(); document.write(xhr.responseText); document.close(); } </code></pre> <p>This way the server-side <code>4nn/5nn</code> error page will be displayed as if it's been caused by a synchronous request. I've posted a <a href="https://stackoverflow.com/questions/1738785/handling-of-server-side-http-4nn-5nn-errors-in-jquerys-ajax-requests">simliar topic</a> about the subject before.</p> <p>Another way is to postpone the session timeout ajaxically. Use <a href="http://www.w3schools.com/jsref/met_win_setinterval.asp" rel="nofollow noreferrer"><code>setInterval()</code></a> to fire a poll request to the server (which in turn basically grabs the session from the request) every time-of-session-expiration-minus-ten-seconds or so.</p> <pre><code>setInterval(function() { $.get('poll'); }, intervalInMillis); </code></pre> <p>But the caveat is that the session will survive as long as the client has its browser window open, which may at times take <em>too</em> long. You can if necessary combine this with sort of <em>activity checker</em> so that the chance that the session get expired will be minimized. You still need to combine this with a decent <code>4nn/5nn</code> error handler. </p> <pre><code>$(document).ready(function() { $.active = false; $('body').bind('click keypress', function() { $.active = true; }); checkActivity(1800000, 60000, 0); // timeout = 30 minutes, interval = 1 minute. }); function checkActivity(timeout, interval, elapsed) { if ($.active) { elapsed = 0; $.active = false; $.get('poll'); // Let server code basically do a "get session from request". } if (elapsed &lt; timeout) { elapsed += interval; setTimeout(function() { checkActivity(timeout, interval, elapsed); }, interval); } else { alert($.messages.timeout); // "You will be logged out" blah blah. window.location = 'http://example.com/logout'; } } </code></pre>
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    1. COMany thanks for your answer.
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