Apache mod_rewrite REDIRECT_STATUS condition causing directory listing
.htaccess, apache, mod-rewrite, regex
Solution
You have this condition to stop looping:
## Internal Redirect Loop Protection
RewriteCond %{ENV:REDIRECT_STATUS} 200
RewriteRule ^ - [L]
This works by checking internal Apache variable `%{ENV:REDIRECT_STATUS}`. This variable is empty at the start of rewrite module but is set to 200 when first successful internal rewrite happens. This above condition says bail out of further rewrites after first successful rewrite and stops looping.
Problem
I have the following htaccess rewrite rules. The one rule condition to prevent looping was originally written this way: ``` RewriteCond %{ENV:REDIRECT_STATUS} ^. ``` It used to work just fine, until it suddenly stopped working causing Apache to display the directory listing of the website. I had to change it to this new form, as in the listing below, to have it work again: ``` RewriteCond %{ENV:REDIRECT_STATUS} 200 ``` Do you have any idea of the reason of this behaviour? Thank you ``` RewriteEngine on RewriteBase / ## Permanent 301 ## Force to www. Un-comment in production. RewriteCond %{HTTP_HOST} !^www\.myhost\.com [NC] RewriteRule ^(.*) http://www.myhost.com/$1 [L,R=301] ## Permanent redirect rules for contents RewriteRule ^argument/programming/?$ tags/programming [NC,L,R=301] ## Internal Redirect Loop Protection RewriteCond %{ENV:REDIRECT_STATUS} 200 RewriteRule ^ - [L] ## Maintenance page #RewriteRule (.*) special/maintenance.html ## Specials RewriteRule special/(.*) special/$1 [NC,L] ## Static resources RewriteRule ^(.*\.(js|ico|gif|jpg|png|css|rss|xml|htm|html|pdf|zip|gz|txt))$ public/$1 [NC,L] ## Front Controller RewriteRule ^(.*) public/index.php [NC,L] ```