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I am trying to define an environment variable in my .htaccess file, and then run a rewrite condition using that variable. Below is what I have in my .htaccess file, but the rewrite is not working:
RewriteEngine on
#set to 'live' or 'maintenance'
SetEnv ENVIRONMENT maintenance
#If the ENVIRONMENT variable is 'mainetnance' then show a maintenance page to the users
RewriteCond %{ENV:ENVIRONMENT} maintenance
RewriteRule ^(.*)$ /maintenance.html
The purpose of this is to set the site to maintenance mode programmatically by having PHP edit the .htaccess file when it receives a post request from one of GitHub's hooks to pull the repo for an update.
819
htaccess rewrite rules can be used to direct requests for one subdirectory to a different location, such as an alternative subdirectory or even the domain root. In this example, requests to http://mydomain.com/folder1/ will be automatically redirected to http://mydomain.com/folder2/.
RewriteCond %{REQUEST_FILENAME} !-f. RewriteCond %{REQUEST_FILENAME} !-d. … means that if the file with the specified name in the browser doesn't exist, or the directory in the browser doesn't exist then procede to the rewrite rule below.
NC = nocase means regardless of the case of the incoming referrer traffic match with the given pattern. See Apache [NC|nocase] flag.
The mod_rewrite module uses a rule-based rewriting engine, based on a PCRE regular-expression parser, to rewrite requested URLs on the fly. By default, mod_rewrite maps a URL to a filesystem path. However, it can also be used to redirect one URL to another URL, or to invoke an internal proxy fetch.
mod_rewrite doesn't use variables set via SetEnv, instead use this method:
#set to 'live' or 'maintenance'
RewriteRule .* - [E=STATUS:maintenance]
#If the ENVIRONMENT variable is 'maintenance' then show a maintenance page
RewriteCond %{REQUEST_URI} !maintenance.html [NC]
RewriteCond %{ENV:STATUS} ^maintenance$
RewriteRule ^.*$ /maintenance.html [L]
The first line of the bottom three, makes sure that once the user is redirected to the file "maintenance.html", it will not be redirected again. Else the user keeps getting redirected to the same file, causing an 500 internal server error saying "AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error."
179
Bit late - but for all the others searching ...
use SetEnvIf - see: mod_rewrite rule and setenv
SetEnvIf Request_URI ".*" ENVIRONMENT=maintenance
...
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