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PONull parameters in MVC action from jQuery ajax call during navigation (IE only)
 

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  1. PONull parameters in MVC action from jQuery ajax call during navigation (IE only)
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    <p>I am a programmer on an MVC/ajax project that receives significant traffic from its customers. We've been seeing one or two isolated instances (per day) of a controller action not receiving parameters from the client.</p> <p>Long story short: the actions are being called via jQuery ajax, and the action params are only null if the ajax call is made while the browser is navigating to another page. IE click a link and then trigger an ajax call.</p> <p>I added some crude validation around these calls to ensure that we aren't actually passing nulls in the ajax data, and this hasn't alleviated the problem. An example of one of the calls is below.</p> <pre><code> var searchValue = _txtSearch.val().trim(); if (searchValue === null || searchValue === undefined || searchValue.length &lt; _minimumLengthForSearch) { _txtSearch.focus(); return; } // clear out the value when launching _txtSearch.val(''); $.post(_quickSearchUrl, { searchString: searchValue }, function (data) {...}, "json"); </code></pre> <p>I found <a href="http://blogs.msdn.com/b/ie/archive/2008/07/14/ie8-ajax-navigation.aspx" rel="nofollow">an old IEBlog post</a> that suggests IE might handle this situation differently from other browsers. I was curious as to whether anyone else has encountered this phenomena before. Again, I can only reproduce this issue in IE and only during page navigation.</p> <p>Edit: It is difficult to reproduce this exception with Fiddler active for some reason, but when I manage to Fiddler displays the following error message: </p> <p>Fiddler has detected a protocol violation in session #4. Content-Length mismatch: Request Header indicated 24 bytes, but client sent 0 bytes.</p>
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    1. USWill
    1. USWill
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      1. USJamie Dixon
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    1. COHi @Will, did you ever find a resolution to this issue? I'm experiencing the exact same problem, so would appreciate any pointers you've got. Cheers.
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      1. USChristopher McAtackney
    2. COWe overrode OnAuthorization and manually detected the case where this occurs. We specifically checked to see whether the request is an ajax request, and then whether the contents match the content length. This isn't ideal, but it works.
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