What does this Mod Rewrite do?

Can anybody tell me what this does?

RewriteRule .* .main.php [QSA,L]

From what I understand it will rewrite ANYTHING to main.php correct? But not so sure what the QSA,L does.

This is the whole .htaccess file, when I hit the main d开发者_运维百科irectory I get a 400 Bad Request error. Edit: Bad request went away when I added an ending slash in the browser to the root directory of this script.

RewriteEngine On


# Transfering to the main tranfer file

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !\.css$
RewriteCond %{REQUEST_FILENAME} !\.js$

RewriteRule .* .main.php [QSA,L]

# nobody is allowed to access the access the  INI file

<FilesMatch "\.inc.php$">
    Order allow,deny
    Deny from all
</FilesMatch>

QSA = Query String Append: append the existing query string to the re-written rule

L = Last Rule: last rule of the set, don't process any following RewriteRule

Check out the documentation for more.

Do you have a file that is named .main.php? The dot prefix worries me. Your rules read that unless the request is an exists, symbolic link, or it has a CSS or JS extension it goes to .main.php