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    <p>The problem seems to be that <a href="http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute" rel="nofollow"><code>timeout</code></a> and <code>ontimeout</code> aren't yet part of some implementations:</p> <pre><code>var hasTimeout = 'timeout' in new XMLHttpRequest(); // false </code></pre> <p>At least, it's not in Chrome 16 or Firefox 7. And, this should return <code>true</code> given the requirements:</p> <blockquote> <p>The <code>timeout</code> attribute must return its value. Initially its value must be zero.</p> </blockquote> <p>Both have been part of the <a href="http://www.w3.org/TR/XMLHttpRequest/" rel="nofollow">XHR 2 spec</a> since <a href="http://www.w3.org/TR/2010/WD-XMLHttpRequest2-20100907/" rel="nofollow">Sept 7, 2010</a>. But, as the "Level 2" spec has been been around since <a href="http://www.w3.org/TR/2008/WD-XMLHttpRequest2-20080225/" rel="nofollow">Feb 25, 2008</a> and is still a "Working Draft," there's not really a guarantee that any implementation would be up-to-date with the spec.</p> <hr> <p>Without those available to you, you can try instead using <code>onabort</code> and <code>setTimeout</code> (as you stated in your comment):</p> <pre><code>// snip to = function() { attempt++; if( attempt &lt; 5) send(); else if( !silent) { console.log("Request Timeout\nFailed to access "+url); } }; // snip var send = function() { if( loader &amp;&amp; attempt != 0) { loader.children[0].firstChild.nodeValue = "Error... retrying..."; loader.children[1].firstChild.nodeValue = "Attempt "+(attempt+1)+" of 5"; } a = new XMLHttpRequest(); a.open("POST","/ajax/"+url,true); a.onreadystatechange = rsc; setTimeout(function () { /* vs. a.timeout */ if (a.readyState &lt; 4) { a.abort(); } }, 5000); a.onabort = to; /* vs. a.ontimeout */ a.setRequestHeader("Content-Type","application/json"); a.send(data); console.log('HTTP Requesting: %s', url); }; // snip </code></pre> <p>Example: <a href="http://jsfiddle.net/AmQGM/2/" rel="nofollow">http://jsfiddle.net/AmQGM/2/</a> -- The <code>?delay=2</code> should finish, while the <code>?delay=10</code> expires its 5 tries.</p>
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    1. POxmlhttprequest timeout / abort not working as expected?
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    1. USJonathan Lonowski
    1. USJonathan Lonowski
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      1. VTUpMod
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    1. CO`"timeout" in new XMLHttpRequest()` returns `true` in the console. According to MSDN it's been there since IE7. I'm not so worried about the `timeout` support because I can always use a `setTimeout` to emulate that. I'm more worried about the `abort()` not working as it should.
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      1. USNiet the Dark Absol
    2. CO+1 for identifying it in the spec timeline
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      1. USKristian
 

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