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POWhy is IE causing HTTP 500 responses from the LAMP server?
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  1. POWhy is IE causing HTTP 500 responses from the LAMP server?
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    copied!<p>I have a cart system that uses (jQuery) AJAX to add a product to the cart, show the cart and update cart quantities.</p> <p>In IE (8/9) the response rate from the server is about 50%. 50% HTTP 200 OK and no problems, 50% HTTP 500 internal server error. The 500 response usually comes after some kind of timeout of about 15 seconds but not always. All other browsers have a 100% success rate so far.</p> <p>Access Log samples below (IE8 and IE9):</p> <pre><code>&lt;ip&gt; - &lt;user&gt; [13/May/2012:01:38:03 +1000] "POST /cart/process/cart.php HTTP/1.1" 500 - "&lt;domain&gt;/cart/process/cart.php?summaryOnly" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)" &lt;ip&gt; - &lt;user&gt; [13/May/2012:00:35:11 +1000] "POST /cart/process/cart.php HTTP/1.1" 500 - "&lt;domain&gt;/cart/process/cart.php?summaryOnly" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)" </code></pre> <p>My assumption so far is that cookie usage (set/delete) is too large (or over the top) for IE and triggers some kind of security flag. That's my absolute best guess so far.</p> <p>The current setup is on a subdomain behind a .htaccess password prompt. The cart summary loads in a fancybox (JS) iFrame. Testing outside of the iFrame made no difference.</p> <p>I do not believe that the problem lies with the front end dev side but I am totally lost. The server team say in must be a browser issue.</p> <p>I hate IE. Anyone got any ideas?</p> <hr> <p>EDIT: I believe I am at least being able to reduce the issue occurring which may suggest a max cookie length issue. Cookies should be &lt; 2Kb or 4Kb/4096 in IE I believe. I also may have had this issue: <a href="http://adamyoung.net/IE-Blocking-iFrame-Cookies" rel="nofollow">http://adamyoung.net/IE-Blocking-iFrame-Cookies</a></p> <p>A similar issue suggesting 500 errors for long cookies here: <a href="http://datatables.net/forums/discussion/576/cookie-limit-long-cookie-fails/p1" rel="nofollow">http://datatables.net/forums/discussion/576/cookie-limit-long-cookie-fails/p1</a></p> <hr>
 

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