.htaccess doesn't pass arguments to url - apache

Question

I was trying to make my server redirecting to a single page every request the user asks.
The way I am doing it is this:
# Turn rewriting on
Options +FollowSymLinks
RewriteEngine On
# Redirect requests to py-server.php if the request is that page (to avoid loops)
RewriteCond %{REQUEST_URI} !=/py-server.php
# Check if it is not an asset that the page requested needs
RewriteCond %{REQUEST_URI} !.*\.png$ [NC]
RewriteCond %{REQUEST_URI} !.*\.jpg$ [NC]
RewriteCond %{REQUEST_URI} !.*\.css$ [NC]
RewriteCond %{REQUEST_URI} !.*\.gif$ [NC]
RewriteCond %{REQUEST_URI} !.*\.js$ [NC]
# Finally, redirects to the page by adding to the URL the path originally requested
RewriteRule ^(.*)$ /py-server.php?path=$1 [L,QSA]
I added some comments to clarify why I've written those lines.
Now, that code is made by pasting various codeblocks from the internet, but it should work from what I read around.
The fact is that the server redirects correctly to the right page, but without the path in the URL (= there isn't the path argument at all).
Note: the .htaccess file is located at the root directory of the site in localhost (I use XAMPP for the server); the request I'm referring to is, simply, the request of any file of the server like /index.php, /some_dir/, /some_dir/index.php;
Did I forgot something to add? or did I make a mistake anywhere?

Answer 1

Alright, I found the solution searching here and there again:
# Turn rewriting on
Options +FollowSymLinks
RewriteEngine On
# Redirect requests to py-server.php if the request is that page (to avoid loops)
RewriteCond %{REQUEST_URI} !=/py-server.php
# Check if it is not an asset that the page requested needs
RewriteCond %{REQUEST_URI} !.*\.png$ [NC]
RewriteCond %{REQUEST_URI} !.*\.jpg$ [NC]
RewriteCond %{REQUEST_URI} !.*\.css$ [NC]
RewriteCond %{REQUEST_URI} !.*\.gif$ [NC]
RewriteCond %{REQUEST_URI} !.*\.js$ [NC]
# Here, this is the line that does the job!
RewriteRule ^(.*)$ /py-server.php?path=%{REQUEST_URI} [R=302,NC]
I solved by putting %{REQUEST_URI} as an argument for the original path to pass and the R=302 flag between squared brackets.
All this code works perfectly, now: redirects ALL the requests to a file.php EXCEPT FOR the assets (JS files, images, GIFs, CSS files...) and the actual final file to avoid loops.
Edit: as MrWhite wrote in the comments, the only problem seems to have been the R=302 flag, because $1 and %{REQUEST_URI} would work in both cases with just a little difference.