.htaccess test if ENV is true or defined

Question

I need to run a set of RewriteCond statements if an ENV is true or defined (if not defined, then presumed false). I've been trying to use:

RewriteCond %{ENV:IS_MOBILE} ^true$
RewriteCond ...

and (not sure if this is even valid)

RewriteCond %{ENV:IS_MOBILE} !=true
RewriteCond...

But neither seem to work. Any way I can do this?

Answer 1

Here's a real life sample that should help you to find the solution:

If the host begins by "s" or "static" then create an environment variable called "STATIC" and set it to "1":

RewriteCond %{HTTP_HOST} (s|static)\.mysite\.com$
RewriteRule (.*) - [QSA,E=STATIC:1]

Then what you may look for: if my hosts is "static" then if the files are considered "static" (img and so on) then stop:

RewriteCond %{ENV:STATIC} 1
RewriteRule (.*)\.(pdf|jpg|jpeg|gif|png|ico)$ - [L]

Now if you want to be sure that the variable doesn't exist, just check if it's empty. Here's my rule just after the previous: it checks if the variable is not empty, and if so, there's an error = 404 (to simulate "not found"):

RewriteCond %{ENV:STATIC} !^$
RewriteRule (.*) /404.php [L]

In your case if your env is not empty you suppose it's true:

RewriteCond %{ENV:IS_MOBILE} !^$
RewriteCond...

In your case if your env is equals, exactly equals to the string "true" you suppose it's "true":

RewriteCond %{ENV:IS_MOBILE} true
RewriteCond...

Hope this helps.