: Mod_rewrite: rewriting http://$SOMETHING.app.example.com/ to http://www.example.com/app/$SOMETHING I'm trying to make http://$SOMETHING.app.example.com/ transparently rewrite to http://www.example.com/app/$SOMETHING.

@Holmes151

We ended up using an external redirect instead.

RewriteCond %{HTTP_HOST} (.*).app.example.com
RewriteRule ^/(.*) www.example.com/app/%1/ [R]

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@Correia994

Perhaps something like:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www.example.com
RewriteCond %{HTTP_HOST} !^example.com
RewriteCond %{HTTP_HOST} ^(.)+.example.com
RewriteCond %{REQUEST_URI} !^/app/
RewriteRule ^(.*)$ app// [L]


Which ensures you're not currently accessing example.com or example.com directly; then takes your prefix, checks that you're not currently accessing at the /app directly (or it will loop forever), and then rewrites. This should be transparent..

Elaborated from corz.org/serv/tricks/htaccess2.php

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@Rambettina238

You need to set a DNS-record for *.app.example.com. to redirect to the IP of the server. I think in your case that will be the same as the one app.example.com.is pointing to.

Edit:
I think one of these should do the trick (normally both):

RewriteCond %{HTTP_HOST} !^app.example.com
RewriteCond %{HTTP_HOST} ^([^.]+)
RewriteRule ^(.*) /app/%1/ [L]

RewriteCond %{HTTP_HOST} ^([^.]+).app.example.com$
RewriteRule ^/(.*)$ www.example.com/app/%1/ [L,R]

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