HTTP/2 push not working when using CDN

[longbigbronzeelephantfish]

Configuration:
Generic Mirror used for CDN
HTTP/2 push enabled for CSS and JS

The generated headers instructs the browser to preload the resources from the website:

The browser ends up preloading the resources but not using them

Editing Minify_Plugin.php from

public function http2_header_add( $url, $as ) {
    if ( empty( $url ) )
        return;
    // Cloudflare needs URI without host
    $uri = Util_Environment::url_to_uri( $url );
    header( 'Link: <' . $uri . '>; rel=preload; as=' . $as, false );
}

to

public function http2_header_add( $url, $as ) {
    if ( empty( $url ) )
        return;
    // Cloudflare needs URI without host
    $uri = Util_Environment::url_to_uri( $url );
    // Get the domain of the CDN
    $domain = Dispatcher::component( 'Cdn_Core' )->get_cdn()->get_prepend_path($uri);
    // Append the domain to the uri
    header( 'Link: <' . $domain . $uri . '>; rel=preload; as=' . $as, false );
}

fixes the problem, but will probably break CloudFlare functionality.

The headers are correct now:

[altimea]

Same problem here. That line is causing my style to be downloaded twice, once with my website url, and the second with my CDN url

[nigrosimone]

this works for both CDN and CloudFlare

/**
* Sends HTTP/2 push header
*/
public function http2_header_add( $url, $as ) {
    if ( empty( $url ) )
        return;
		
    $domain = '';
			
     // Cloudflare needs URI without host
    $uri = Util_Environment::url_to_uri( $url );
		
    // CDN always require domain
    if( $this->config->get_boolean( 'cdn.enabled' ) ){
        $domain = Dispatcher::component( 'Cdn_Core' )->get_cdn()->get_prepend_path($uri);
    }
		
    header( 'Link: <' . $domain . $uri . '>; rel=preload; as=' . $as, false );
}