v0.44.0

v0.44 contains a lot of fixes related to HTTP Datagrams, new logic to determine (and configure) the QUIC packet size, as well as a significant speedup of the various parsers.

HTTP Datagram-related Fixes

The last release introduced support for HTTP Datagrams (RFC 9297). This release resolves a number of problems we discovered in the initial implementation:

• reject sending of DATAGRAM frames that exceed the currently available MTU (#4497)
• http3: deadline errors are now ignored in stream state tracking (#4495)
• http3: refuse to send HTTP datagrams associated with a closed stream (#4488)
• http3: use the send stream context for tracking the stream state (#4489)
• http3: fix memory leak caused by stream state tracking (#4523). Thanks to @GeorgeMac for debugging and fixing!

QUIC Packet Size and Path MTU Discovery

• The initial packet size is now configurable via quic.Config. Most users should not use this config option, but instead rely on Path MTU discovery (#4503)
• The client's initial packet size was increased to 1280 bytes (#4500)
• Respect the client's max_udp_payload_size transport parameter (#4514)
• qlog: add support for the mtu_updated event (#4517)

Speeding up Parsing the variable-length Integers

The QUIC varint parser was rewritten to act on byte slices instead of a bytes.Reader. This is significantly faster (#4475). The new parser is now used for parsing QUIC frames (#4484), the QUIC packet header (#4481), the QUIC transport parameters (#4483) and HTTP datagrams (#4478).

Other Notable Changes

• http3: ParseCapsule now returns an io.EOF (and not an io.UnexpectedEOF) if the underlying reader returns an io.EOF on the first byte (#4476)
• http3: ListenAndServe was renamed to ListenAndServeTLS (#4522). Thanks to @ETZhangSX!
• http3: reserved frame types now cause a connection error, as required by the RFC (#4467)
• http3: pass the correct Connection to the ConnContext callback (#4480). Thanks to @rthellend!

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What's Changed

• build(deps): bump golangci/golangci-lint-action from 4 to 5 by @dependabot in #4472
• http3: return an io.EOF when parsing a capsule fails on the first byte by @marten-seemann in #4476
• quicvarint: add a function to parse a varint from a byte slice by @marten-seemann in #4475
• http3: avoid allocation when parsing the datagram's quarter stream ID by @marten-seemann in #4478
• http3: Pass original Conn to ConnContext by @rthellend in #4480
• http3: reject reserved frame types by @marten-seemann in #4467
• fix capture of loop variable in connection probe packet tests by @marten-seemann in #4486
• http3: refuse to send datagrams associated with a closed stream by @marten-seemann in #4488
• http3: use the stream context to detect when the send side is closed by @marten-seemann in #4489
• wire: use quicvarint.Parse to when parsing transport parameters by @marten-seemann in #4482
• wire: use quicvarint.Parse when parsing frames by @marten-seemann in #4484
• wire: refactor header parsing to use quicvarint.Parse by @marten-seemann in #4481
• wire: reduce allocations when parsing transport parameters by @marten-seemann in #4483
• fix incorrect reuse of UDP connection in handshake benchmark by @marten-seemann in #4491
• http3: fix race condition when creating state tracking stream by @marten-seemann in #4493
• ci: run benchmarks by @marten-seemann in #4492
• http3: ignore deadline errors when tracking QUIC stream states by @marten-seemann in #4495
• ci: update golangci-lint-action to v6 and golangci-lint to v1.58.0 by @marten-seemann in #4494
• ci: disable exhaustive linter for test files by @marten-seemann in #4499
• add an integration test for DPLPMTUD by @marten-seemann in #4498
• reject sending of DATAGRAM frames that exceed the current MTU by @marten-seemann in #4497
• wire: write configured value of max_udp_payload_size transport parameter by @marten-seemann in #4501
• increase initial packet size to 1280 bytes (for both IPv4 and IPv6) by @marten-seemann in #4500
• make the initial packet size configurable by @marten-seemann in #4503
• update all golang.org/x dependencies by @marten-seemann in #4506
• initialize the MTU discoverer when processing the transport parameters by @marten-seemann in #4514
• retry the MTU integration test up to 3 times by @marten-seemann in #4519
• logging / qlog: add support for DPLPMTUD by @marten-seemann in #4517
• http3: rename ListenAndServe to ListenAndServeTLS by @ETZhangSX in #4522
• fix(http3): handle streamStateSendAndReceiveClosed in onStreamStateChange by @GeorgeMac in #4523

New Contributors

• @ETZhangSX made their first contribution in #4522

Full Changelog: v0.43.0...v0.44.0