HTTP/3 API and implementation

[vietj]

Implementation of HTTP API with HTTP/3.

This implementation makes use of Vert.x Quic stream implementation.

Todo

• implementation
  • outer context integration and testing
  • metrics
  • tracing
  • send file
  • push
    • client
    • server
  • network activity logging
• API
  • breaking changes
    • identify
    • decide
  • dev
    • options
    • connection close payload
  • request cancellation superseding request reset
• Improve Netty Quic reset
• go away strategies ?
• documentation
• ...

Breaking changes

Implementing HTTP/3 implies a few potential breaking changes, the strategy to handle them will be on a case by case basis and attempt to minimize the amount of breaking changes to delay them until Vert.x 6 is implemented, here is a non exhaustive list:

• stream id declares long type instead of int
• settings
• ...

H2/H3 discrepancies

Shutdown / GoAway

• H2: GoAway carries stream id + error code + debug data
• H3: GoAway only carries stream id, but quic can close with an error code + reason data, error code seems similar but reason is not the same semantic than debug.

Reset semantic

• H2: reset means immediate termination of a stream
• H3: reset only applies to the stream outbound and means no more data will be set

Introduce stream cancellation that performs the most adapted operation according to the protocol:

• H2 : reset with 0x8 (CANCEL) code
• H3 : reset or abort reading with REQUEST_CANCELLED code

[vietj]

See #5802