There is a mod_http2/mod_proxy_http2 backport proposal in 2.4.x/STATUS that accumulates this years changes from the github version. This includes several bugfixes, 2 of which from Michael Kaufmann (Thanks!), for issues reported:
*) mod_http2: HEAD requests to some module such as mod_cgid caused the stream to terminate improperly and cause a HTTP/2 PROTOCOL_ERROR. Fixes <https://github.com/icing/mod_h2/issues/167>. [Michael Kaufmann] *) mod_http2: when SSL renegotiation is inhibited and a 403 ErrorDocument is in play, the proper HTTP/2 stream reset did not trigger with H2_ERR_HTTP_1_1_REQUIRED. Fixed. [Michael Kaufmann] *) mod_proxy_http2: changed mod_proxy_http2 implementation and fixed several bugs which resolve PR63170. The proxy module does now a single h2 request on the (reused) connection and returns. [Stefan Eissing] *) mod_http2: enable re-use of slave connections again. Fixed slave connection keepalives counter. [Stefan Eissing] Two features have also been implemented: *) mod_http2: new configuration directive: ```H2Padding numbits``` to control padding of HTTP/2 payload frames. 'numbits' is a number from 0-8, controlling the range of padding bytes added to a frame. The actual number added is chosen randomly per frame. This applies to HEADERS, DATA and PUSH_PROMISE frames equally. The default continues to be 0, e.g. no padding. [Stefan Eissing] *) mod_http2: Configuration directives H2Push and H2Upgrade can now be specified per Location/Directory, e.g. disabling PUSH for a specific set of resources. [Stefan Eissing] For the H2Padding, I also wrote a blog at: https://icing.github.io/mod_h2/padding.html It would be nice if 2 people could find the time to have a look at it. Cheers, Stefan