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POWhy does Internet Explorer not send HTTP post body on Ajax call after failure?
 

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  1. POWhy does Internet Explorer not send HTTP post body on Ajax call after failure?
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    <p>We are able to reliably recreate the following scenario:</p> <ol> <li>Create a small HTML page that makes AJAX requests to a server (using HTTP POST)</li> <li>Disconnect from the network and reconnect</li> <li>Monitor the packets that IE generates after the failure</li> </ol> <p>After a failed network connection, IE makes the next AJAX request but only sends the <strong>HTTP header</strong> (not the body) when doing the HTTP post. This causes all sorts of problems on the server as it is only a partial request. Google this issue with Bing and you'll find lots of people complaining about "random server errors" using AJAX or unexplained AJAX failures. </p> <p>We know that IE (unlike most other browsers) always sends an HTTP POST as TWO TCP/IP packets. The header and body is sent separately. In the case directly after a failure, <strong>IE only sends the header</strong>.</p> <p>So my question is - why does it behave this way? It seems wrong based on the HTTP spec and other browsers don't behave this way. Is it simply a bug? Surely this creates havoc in any serious AJAX based Web application.</p> <p><strong>Reference information:</strong></p> <p>There is a similar problem, triggered by HTTP keep-alive timeouts that are shorter than 1 minute and is documented here:</p> <p><a href="http://us.generation-nt.com/xmlhttprequest-post-sometimes-fails-when-server-using-keep-aliv-help-188813541.html" rel="noreferrer">http://us.generation-nt.com/xmlhttprequest-post-sometimes-fails-when-server-using-keep-aliv-help-188813541.html</a></p> <p><a href="http://support.microsoft.com/default.aspx?kbid=831167" rel="noreferrer">http://support.microsoft.com/default.aspx?kbid=831167</a></p> <p>Here are the before and after failure packet captures:</p> <p>Notice how the HTTP Header and Payload is sent <a href="http://img827.imageshack.us/i/beforee.png/" rel="noreferrer">http://img827.imageshack.us/i/beforee.png/</a></p> <p>After a failure, notice how only the Header is sent. IE <em>never</em> sends the payload and the server eventually responds with a Timeout. <a href="http://img203.imageshack.us/i/retryt.png/" rel="noreferrer">http://img203.imageshack.us/i/retryt.png/</a></p>
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    1. USJonathon Faust
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      1. USMr. Shiny and New 安宇
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    1. COThis is an excellent, well-defined question that deserves an answer. Unfortunately, this is a little off topic. I'm not sure if it would be better on http://webmasters.stackexchange.com or http://superuser.stackexchange.com.
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      1. USStephen
    2. CO@gilly3, I think something must be wrong with me, because I read that and was just nodding along...
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    3. COI suggest http://www.fiddler2.com/fiddler2/ for better debugging the protocol. :)
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      1. USTedd Hansen
 

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