HTTP/2 (full decoding)

Dependencies:

• #218 HTTP/2 (minimal)

Tasks:

• [ ] Implement demuxing streams it into separate request/response streams and calling the same HTTP callbacks as the HTTP/1.x protocol driver for logging and header manipulation; this requires parsing the stream framing protocol and decompressing compressed headers (consider library/libraries for some or all of this, but should have BSD or MIT license and be portable)
• [ ] Handle and decode Server Push for logging appropriately (not sure how yet; similar to WebSockets)
• [ ] Consider suppressing all except harmless HTTP/2 extensions because they may break protocol parsing
• [ ] Adjust logging for new HTTP/2 concepts; log system will need refactoring to deal with stream IDs and Server Push
• [ ] Test on different platforms and with different browsers/clients

Out of scope:

• Support for predecessor protocols like SPDY
• Spec compliant stream priority handling
• Opportunistic Security for HTTP/2 (RFC 8164)

References:

• https://en.wikipedia.org/wiki/HTTP/2
• https://tools.ietf.org/html/rfc7540
• https://github.com/nghttp2/nghttp2
• https://github.com/phluid61/mk-hpack