Hi,

The context: Nginx + php7fpm + Cloudflare free plan

I enabled the Http2 Push Server feature:

• For logged or not logged user, the front works correctly, the javascript and css files are well pushed.

• When I access the administration pages error 502, I get a 502 error. In the nginx logs, I have "Can not Push Server (header size over 3072 Bytes)"

I tried to change the "fastcgi_buffer_size" and "fastcgi_buffer", and I modified the code of the cloudflare plugin to increase the limit "headersize":
if ($headerSize > 3072) { error_log('Cannot Server Push (header size over 3072 Bytes).'); return $src; }
to
if ($headerSize > 7168) { { error_log('Cannot Server Push (header size over 7168 Bytes).'); return $src; }
=> without success, header size were always too big (I do not understand why the headers are so big).
I looked for different solution by playing on the buffer, without success..

If I go back to my problem, the only pages that pose a problem are the administration pages, administration pages with push server enabled. I do not need to push server on these administration pages (and in general, I do not see any need).

If I disabled push server for administration pages:

    public static function initHooks()
    { 
		// Change: disable the push server if it is an admin page
		if (is_admin()) {
			return;
		};
	
        self::$initiated = true;

        add_action('wp_head', array('\CF\WordPress\HTTP2ServerPush', 'http2ResourceHints'), 99, 1);
        add_filter('script_loader_src', array('\CF\WordPress\HTTP2ServerPush', 'http2LinkPreloadHeader'), 99, 1);
        add_filter('style_loader_src', array('\CF\WordPress\HTTP2ServerPush', 'http2LinkPreloadHeader'), 99, 1);
    }

=> Everything is working fine, frontend is pushed, admin page without error and not pushed

Maybe there is a better solution? or can this solution be integrated without risk?