I'd like to use early hints on some pages served on an apache+php configuration. Early hints work similarly to HTTP2 push, and allow a browser to initiate download of resources early, while the actual HTML is still being generated or downloaded.
Is this possible with the current configuration? My understanding is that with the nginx proxy acts as SSL terminator and HTTP2 protocol wrapper, the communication with the apache server is on HTTP which would not allow configuring and sending the headers. Are there workarounds short of having a cloud worker handle traffic and rewrite responses?