Implement h2-14

[mad-p]

Converted this issue's goal to h2-14 (Sep 5, 2014). Last update Sep 16, 2014.

MUST

• HPACK-09
  • Static table change
  • Huffman code change
  • Switch static/header table index order
  • Remove reference set
  • Emit context update after SETTINGS_HEADER_TABLE_SIZE
• Framer
  • 24-bit frame size
  • Default max frame size is 16384, not 16383
  • Setting identifier is now 16-bit
  • Remove PAD_HIGH, padding in CONTINUATION
  • Allow extension frames, extension settings
  • Check incoming frame format
• Settings handling
  • Add SETTINGS_MAX_HEADER_LIST_SIZE
  • Add SETTINGS_MAX_FRAME_SIZE
    • Default max frame size is now 16384 (not 16383)
  • Separate settings for self and peer
  • Wait for SETTINGS ack
    • Suspend next outgoing frame until ack
• Stream, Connection
  • Stream statemachine
    • PRIORITY after stream close allowed
    • Represent waiting CONTINUATION with either a flag or statemachine states
  • Headers splitting/continuation (DATA, HEADERS, PUSH_PROMISE)
  • Remove handling header fields with multiple values
  • Pseudo headers at the beginning
  • Remove END_SEGMENT
  • Separate counting of concurrent streams between self- and peer- initiated
  • Multiplex outgoing streams
  • Trailing HEADER handling
  • Allow incoming packet smaller than a frame
  • Count separately incoming/outgoing streams
  • Flow control
    • Separate flow control between incoming and outgoing traffic
    • Better frame sizing for stream- and connection- level window
    • Better frame sizing by combining flow control and max frame size handling
    • Emit WINDOW_UPDATE after processing received DATA (maybe app layer's job)
  • Error handling
    • correctly generate outgoing connection/stream error
    • correctly handle incoming connection/stream error
• Client, Server

Nice to have

• Starting HTTP/2
  • NPN
  • ALPN
  • Upgrade
• Integration with HTTP/1.1
  • Drop-in replacement wrapper for HTTPClient
  • Drop-in replacement wrapper for NET::HTTP
  • Adapter for Rack (or Webrick)
• Integration with ruby-eventmachine
• Priority handling
  • Implement dependency tree
  • Implement weights
• Proxy
  • CONNECT method
• Rare cases
  • GOAWAY to prevent stream_id overflow
  • 2-phase GOAWAY (stream id 2^31-1)
  • content-length vs DATA length check (beware of HEAD response)