Rails spinoffs - May 2008 - IE 6 performance issues with AJAX Requests

Hey, Sorry to bug you on a Saturday, but I am having some real
performance issues with prototype''s AJAX in IE 6. The request will
intermittently drop the response text but return a valid status of
200. To eliminate the possibility of errant requests I have the test
call the same query repeatedly. Out of 15 requests made an average of
4 will return empty. This has nothing to do with the number of clicks
or the speed in which they are made (something I''ve tested
extensively). Sometimes it can be the first or the last 5 requests
there doesn’t seem to be any pattern to it. I''ve had upwards of 15
requests in a row return this way. To make sure the request isn’t
cached I''ve added a timestamp to the parameters so it will always have
something new (I''ve heard mention about IE caching requests)

MySQL 5.1 backend with PHP 5 returns a JSON formatted block of text.
Using the latest prototype.js (1.6.0.2) on IE 6.0.3790.3959

http://clients.morgangraphics.com/personal/prototype/index.php shows
the test and is broken down into its most simple parts. If you click
the countries several times you will eventually run across a few of
these, often in groups.

QUERY = far.get_results(38);
RESPONSE RESPONSE Status= 200
RESPONSE RESPONSE TEXT
This isn’t an issue in Firefox, only IE.

I''ve tried every iteration of requests, invoking event listeners etc.
I can’t seem to track this one down. Any help would be greatly
appreciated.

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I''ve spent two days trying to track down the issue with IE 6 randomly
dropping the response after a valid request. It would consistently
return a 200 status code with an empty responseText. Even commenting
out the JSON object and placing plain text string in its place it
would randomly fail, not finding a pattern was the most frustrating.
I even went as far as comparing Msxml2.dll versions in hopes it would
reveal something. I wish I could tell you what the deal is; however
there seems to be a real bug with IE 6 using POST.  I mean it is
completely random in its functioning/non-function manner. Changing the
request to GET seems to have solved the immediate issue; I find it
incredibly strange that the POST fails randomly in IE 6 only. Anyway,
I’ve added another test that shows the difference between POST/GET.

POST
http://clients.morgangraphics.com/personal/prototype/index.php

GET
http://clients.morgangraphics.com/personal/prototype/index2.php

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