htaccess - redirect DNS entry to sub folder but without sub folder in url

Question

My problem is that my domain example.com points to the root directory of my server (normal behaviour) but the website is located in the subdirectory sub .

With the following .htaccess I achieved that my domain is redirected to the subdirectory sub without changig the URL!

RewriteEngine On
RewriteRule !^/sub /sub%{REQUEST_URI} [L,NC]

The frontpage is displayed correctly and the url is still example.com (that's correct). But when I click on a link to visit a sub page (Example link: example.com/my-company), the page redirects me to example.com/sub (so back to the frontpage - I don't want that). After the redirect these links still don't work.

How can I achieve that these links work without the subfolder in the address bar? To summarize:

I redirect my domain example.com to a sub folder called sub and don't display the folder sub in the address bar. I want, that the whole page works without the sub folder in the address bar.

In the background we use typo3. Here is the .htaccess of the sub folder:

Options None
Options +FollowSymlinks

RewriteEngine On
RewriteBase /sub

RewriteRule ^(typo3|t3lib|tslib|fileadmin|typo3conf|typo3temp|uploads|showpic\.php|favicon\.ico)/ - [L]
RewriteRule ^typo3$ - [L]
RewriteRule ^typo3/.*$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule .* index.php

# to avoid double content
RewriteCond %{HTTP_HOST} !^www\.example\.com$
RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301]

So, how do I achieve this?

Answer 1

This is because RewriteRule will issue a redirect by default. You need to tell it not to perform a redirect. You can do this using the PassThrough floaf [PT]

The following should then work:

RewriteRule !^/sub/(.*)$ /sub/$1 [L,NC,PT]