Wordpress messing up rewrite rules - wordpress

Question

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www.app.domain.com$
RewriteCond %{REQUEST_URI} !^/app/
RewriteRule (.*) /app/$1
RewriteCond %{HTTP_HOST} ^app.domain.com$
RewriteCond %{REQUEST_URI} !^/app/
RewriteRule (.*) /app/$1
The problem: app.domain.com is working without problems, but as soon as you add a subfolder like app.domain.com/folder you get the Wordpress tag page.
What am I doing wrong?

Answer 1

The problem is here
RewriteCond %{REQUEST_URI} !^/app/
RewriteRule (.*) /app/$1
Which says that if the URL does not start with /app/ (which /folder doesn't) it must be rewritten to /app/folder. After that rewrite the RewriteRules will be processed again, and the wordpress section will find that folder doesn't exist and fire up wordpress for you.
The way to resolve this issue is to change the last block to
RewriteCond %{HTTP_HOST} ^(www\.)?app\.domain\.com$
RewriteRule %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/app/
RewriteRule .? app%{REQUEST_URI} [L]
This tells apache it may only rewrite to /app/folder if /folder does not exist.
(and you can remove the whole stuff for app.domain.com, this block handles both www.app.domain.com as well as app.domain.com