javascript: How to always serve fresh minified dynamic CSS/JS files? PHP

I am working on joomla compression plugin that is serving cached CSS and JS files. It is working as intended http://ift.tt/1B6YekG

but few site speed tests are downgrading the performance because I use

cached_file_hash.php?v=123

Reason I use it is to make sure fresh file is served if there was change to any logged files. If there was a change

version changes with


// Version files
private function versionFiles($file){

    $version = hash("crc32b",filemtime($file));
    return '?v='.$version;

}

So the testers reply with, Resources with a "?" in the URL are not cached....

My first thought was unicode the ?v= which comes to


%3Fv%3D

Well that fails with 403 forbidden ( I might be missing something here. Joomla? ) http://ift.tt/1B6YekI

Maybe a small change is needed in my gzip snipp in order to serve fresh file and not use ?v= in url http://ift.tt/1rPVlfH

Any toughs are appreciated.

javascript