OpenID AX, Google and mod_rewrite

I am trying to implemented an OpenID for our project(Zend, PHP, Apache), and hitting a weird problem. After user authenticates at the provider's side and is sent back to our website, apache gives 500 Internal S开发者_如何学Cerver Error response. Logs are completely blank. I've noticed though that when using OpenID AX with Google, they returning way too large of a URL. First I thought that this is related to the problem described here: https://serverfault.com/questions/140852/rewritten-urls-with-parameter-length-255-dont-work

But apparently htaccess that we use, never checks any files for existence, and doesn't really do regex also. As a matter of fact it's as simple as 3 lines below:

RewriteEngine on
RewriteRule (libs\/TinyMCE.*)$ - [L]
RewriteRule !\.(js|ico|gif|jpg|png|css|swf|xml|avi|flv|mov|mp3|wav)$ index.php [L]

Turning off AX - makes problem go away

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I had created OpenID Auth with Zend Open ID

with the addition from

How do I implement Direct Identity based OpenID authentication with Zend OpenID

its 100 % working and with out using the AX at all example : http://zc.dagho.com/index/login

the only problem is : i can't ask google about user's email , name etc :(

but regarding your problem can try to double check the $returnTo

and test it on other machine

hopefully it might give a clue