v1.10.0-beta.3 - HTTP/2 client beta release 3

Hello! Back from some dormant :)

This is a BETA RELEASE of our HTTP/2 client. As it is difficult for us to test our client against all possible situations. The beta release is meant for people to experiment and try our HTTP/2 client and report what does and does not work. This beta branch is synced with our main branch at least once per (beta) release.

Please help us test our HTTP/2 implementation. Open an issue and tag @marty1885 if you found any.

Comment on our compatibility tracker if you like. This allows us to gather a list of known working sites :)

BR, Martin Chang

Fixes

• Fixes in HTTP/2 client protocol implementation to improve stability and compatibility
  • Increased connection and stream level flow level RX window to improve throughput
  • Proper respect of DYNAMIC_TABLE_SIZE and INITIAL_WINDOW_SIZE settings from server
  • Various UAF fixes
  • Handle malicious server triggering overflow in flow control window
  • GOAWAY frame correctly ignores MSB of last stream ID
  • Headers with uppercase letters are treated as malformed
  • Fix overly strict asserts in debug mode
  • Corrected padding serialization in frames
  • Responses with long headers but no body are handled correctly

Changes

• Synced with latest master branch
• Environment variable DROGON_DISABLE_HTTP2_CLIENT=1 will disable HTTP/2 in client
• HttpClient supports setPingInterval(seconds) to send periodic PING frames to keep the connection alive
• Relax recoverable protocol errors instead of killing the connection
• Support trailers in HTTP/2 responses

Limitations

Please open an issue if you need any of them.

• No H2C (HTTP/2 over cleartext) support
• Technically supports handling server push. But no API to expose it to the user yet
• Does not support setting HTTP request dependency and priority