DirectoryIndex index.php

<IfModule mod_rewrite.c>
    RewriteEngine On

    # Pass the Authorization header to PHP as an environment variable, if needed
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]


    # Existing rules for routing through index.php
    RewriteRule ^$ index.php [QSA,L]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>

