Keep-Alive prohibited in HTTP/2

Keep-Alive - HTTP | MDN https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Keep-Alive

 

Warning: Connection-specific header fields such as Connection and Keep-Alive are prohibited in HTTP/2. Chrome and Firefox ignore them in HTTP/2 responses, but Safari conforms to the HTTP/2 specification requirements and does not load any response that contains them.