htaccess non-www rewrite showing index.php in URL

Question

I am using htaccess to rewrite any www url to a non-www version

RewriteCond %{HTTPS} !=on
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

When I type domain.com/about it works fine, however when I type www.domain.com/about it changes the URL to domain.com/index.php?p=about

I have 'omitScriptNameInUrls' => true, enabled. I also have this in my .htaccess file

RewriteEngine On

# Send would-be 404 requests to Craft
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/(favicon\.ico|apple-touch-icon.*\.png)$ [NC]
RewriteRule (.+) index.php?p=$1 [QSA,L]

What am I doing wrong here?

Edit: Here is the the vhost file.

<VirtualHost *:80>
    ServerName domain.com
    ServerAdmin [email protected]
    DocumentRoot /var/www/

    <Directory /var/www/>
        Options Indexes FollowSymLinks MultiViews
        AllowOverride All
        Order allow,deny
        allow from all
    </Directory>

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Answer 1

Check out the official Apache documentation on Canonical domain rewrites: https://httpd.apache.org/docs/2.4/rewrite/remapping.html#canonicalhost

Answer 2

The answer to this question was the positioning of content in the .htaccess file.

Move:

RewriteCond %{HTTPS} !=on
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^ %{ENV:PROTO}://%1%{REQUEST_URI} [R=301,L]

Before this:

# Send would-be 404 requests to Craft
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/(favicon\.ico|apple-touch-icon.*\.png)$ [NC]
RewriteRule (.+) index.php?p=$1 [QSA,L]

Although the L tag was in the previous statement, it should be the last rule applied, it doesn't work (probably because I was activating the RewriteEngine again later so it resets the rules, but if the L flag was active in the first rule, it wouldn't apply the www one anyway).

The rule of thumb is: first do your cosmetic changes to the domain, then apply the functional rules.