Description:
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I am having weird issues with AJAX returns postbacks using PHP on Apache and IIS 
same javascript with same data returned works fine on IIS.
The source code is downloadable from 
https://github.com/akshaysrin/CanvasControlLibrary look at the formsbased.php in 
phpexample1 folder.
I have wasted hours getting it to work on php whereas it tooks minutes in ASP.Net 
no idea what to do please help need to support PHP.
Debugging the javascript in Google Chrome sometimes it never comes back from AJAX 
calls sometimes with internal error 500 status sometimes with DOM Exception in 
status of AJAX xmlhttp response.  Same code like I said works with the same data 
sent back on IIS ASP.NET when served from an aspx page if you happen to have a 
windows machine with IIS the example is there also.
Using the Zend Server PHP server installed from their package.  The IIS PHP is 
from your site download and installed all latest.

Test script:
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URL to code is given freely downloadable open source.

Expected result:
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Page should work like it does from IIS and ASPX/ASP.NET page.

Actual result:
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Page works differently when served from PHP zend server.