What seemed like a tiny change resulted in updating phpunit and codesniffer and fixes of the codebase accordingly.
Anyway the point is HTTP2 response can be resolved by the client now.
The builds for php5.4 and php5.5 are red due to compatibility reasons. I strongly suggest dropping support of EOLed versions of php: 5.x, 7.0 and possibly 7.1, see https://www.php.net/supported-versions.php.
What seemed like a tiny change resulted in updating phpunit and codesniffer and fixes of the codebase accordingly. Anyway the point is HTTP2 response can be resolved by the client now.