Prevent redirect loop in mod_rewrite


I'm writing a rule in my htaccess that basically says this:

  • If the request is for the homepage
  • And a cookie has not been set
  • Rewrite the page with /addCookie.php

Then in addCookie.php, we set the cookie and redirect back to the homepage.
This is all fine, but if the user doesn't accept cookies, we get an infinite loop of redirects.

I'm new to mod_rewrite, I've done a lot of searching, but can't break the loop. I have this so far:

  RewriteCond %{ENV:REDIRECT_STATUS} 200
  RewriteRule .* - [S=1]

  RewriteCond %{REQUEST_URI} "^/$"
  RewriteCond %{HTTP_COOKIE} !device_detected
  RewriteRule ^ addCookie.php [L]

Is what I'm trying to do possible? I could add a query string on the redirect from addCookie.php, but I'd much rather keep the requests identical.

Any suggestions kindly welcome.

Best Answer

Yes, that's impossible; the REDIRECT_STATUS won't be present when the client is the one handling the redirect (from the addCookie.php location back to /).

Why not simply set a cookie as part of your home page handling if one wasn't sent by the client, and potentially harass the user if they didn't accept the cookie and it's needed for your application?

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