OpenID AX, Google and mod_rewrite problem

Question

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 Server 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: http://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

I am completely perplexed, so hopefully someone can shed some light on this for me.

Answer 1

I had created OpenID Auth with Zend Open ID

with the addition from

http://stackoverflow.com/questions/741345/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