Frontloading mod_rewrite rule is causing index.php to load twice

I've been working on a project that uses a frontloader to handle all requests (Routing domain.com/args/go/here to Index.php?req=args/go/here), and it's worked very well... Or I should say, I thought it did - I recently added a new logger, and to test it I placed a test log message in index.php. This message was being written to my log file twice, every time I reloaded the开发者_开发知识库 page, and after much debugging I found the cause to be my .htaccess file - for whatever reason, it loads index.php twice for every request.

Here's my .htaccess:

RewriteEngine On
RewriteBase /site/beta/ #I added this after I discovered the bug
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^index\.php$ #This too. Doesn't work
RewriteRule ^(.*)$ index.php?args=$1 [L]

I've also tried:

FallbackResource /site/beta/index.php

Which both doesn't work (Index.php just doesn't load if you try to go to, say, 127.0.0.1/site/beta/admin/controls/ - but it does if you just go to /index.php), and still loads twice.

Is anyone able to help me? I spent a few hours in IRC, and no one could come up with a solution that worked. (The two above are the only ones suggested)

Are you completly sure it's a mod_rewrite bug? If you enable RewriteLog file with a high rewriteLogLevel (9) do you see the same requests handled 2 times?

For me every time I see the 'same request done 2 times' I think about another strange web bug: The empty IMG src bug.

If you have somewhere in your HTML an

<IMG SRC="">

or in one of the css (harder to find) a:

url()

Then you've got it. HTTP protocol dictate that an empty GET url (and an image or url() in css is a GET implicit request) MUST be a call to the same url as the one which render the original page (and it can be a POST as well if you get your page as a POST request).

There're really few reason to have a mod_rewrite responding 2 times to one single request. Check with Firebug or LiveHTTP Requests that you're not always sending the index.php request 2 times. Or test your server with a telnet-mode HTTP request, by hand, as this will certainly send only one request.

This can also be the browser trying to load (invisibly it seems unless you check the apache access logs) favicon.ico. I had the same issue until I put one in my sites root directory. I know the issue was resolved for the initial asker, I'm putting this here for people like myself looking for an answer to the same question.