v0.12.0

This release updates webtransport-go to draft-16, and adds support for WebTransport flow control and session pooling.

New Features

• Added WebTransport session flow control for stream counts (WT_MAX_STREAMS and WT_STREAMS_BLOCKED) and total stream data (WT_MAX_DATA and WT_DATA_BLOCKED). Configure initial receive limits with Config.MaxIncomingStreams, Config.MaxIncomingUniStreams, and Config.MaxIncomingData on Transport or Server. Flow control is negotiated only when both peers advertise it and is required for multiple sessions on one connection. Stream-count flow control: #293, #298, #300, #301, #304, #311, #312, #324, #325; data flow control: #329, #331, #332, #333, #340; protocol validation and session pooling: #305, #342
• Added ClientConn and Transport.NewClientConn, allowing applications to maintain multiple client QUIC connections and establish multiple concurrent WebTransport sessions on each connection. ClientConn also implements http.RoundTripper: #344

Breaking Changes

• Dialer was renamed to Transport: #343

Other Changes

• Stream, SendStream, and ReceiveStream now expose StreamID, returning the underlying QUIC stream ID: #347

Notable Fixes

• SendStream.Write now returns an error after Close or CancelWrite is called while the stream header is being sent asynchronously, preventing payload writes after the stream is closed or canceled: #328
• Malformed capsules now close the session with H3_DATAGRAM_ERROR: #299
• Client and server session setup now stops waiting for HTTP/3 SETTINGS when the QUIC connection closes: #346
• The client now waits for the QUIC handshake and rejects servers that don't support QUIC datagrams or stream reset partial delivery, returning a RequirementsNotMetError: #351

What's Changed

• avoid buffering skipped capsules by @marten-seemann in #290
• extract capsule parsing into a separate file by @marten-seemann in #289
• fix missing context cancelation in Session.Open{Uni}StreamSync by @marten-seemann in #297
• move stream handling into incoming and outgoing maps by @marten-seemann in #294
• implement parsing and serialization of WT_MAX_STREAMS capsules by @marten-seemann in #293
• use H3_DATAGRAM_ERROR when parsing a capsule fails by @marten-seemann in #299
• implement handling of the peer’s stream limit by @marten-seemann in #298
• implement parsing and serialization of WT_STREAMS_BLOCKED capsule by @marten-seemann in #300
• ci: bump actions/checkout from 6 to 7 by @dependabot[bot] in #302
• ci: fix race condition in example workflow by @marten-seemann in #303
• implement capsule sending logic in the session by @marten-seemann in #301
• reject WT_MAX_STREAM_DATA and WT_STREAM_DATA_BLOCKED capsules by @marten-seemann in #305
• add support for sending WT_STREAMS_BLOCKED capsules by @marten-seemann in #304
• ci: remove unneeded staticcheck rule for quic.ConnectionTracing{ID, Key} by @marten-seemann in #308
• use a generic implementation for the outgoing streams map by @marten-seemann in #307
• use a generic implementation for the incoming streams map by @marten-seemann in #309
• reject WT_MAX_STREAMS that decrease the stream limit by @marten-seemann in #312
• send WT_MAX_STREAMS capsules to grant new stream credit by @marten-seemann in #311
• Send CONNECTION_CLOSE before tearing down the listener on Close() (0.11 regression) by @ItalyPaleAle in #295
• ci: bump golangci/golangci-lint-action from 9.2.1 to 9.3.0 by @dependabot[bot] in #322
• ci: bump docker/build-push-action from 7.2.0 to 7.3.0 by @dependabot[bot] in #320
• ci: bump docker/login-action from 4.2.0 to 4.4.0 by @dependabot[bot] in #321
• ci: bump docker/setup-qemu-action from 4.1.0 to 4.2.0 by @dependabot[bot] in #318
• ci: bump docker/setup-buildx-action from 4.1.0 to 4.2.0 by @dependabot[bot] in #319
• reject non-increasing WT_MAX_STREAMS limits by @marten-seemann in #324
• add a Config to set incoming and outgoing stream limits by @marten-seemann in #325
• move send and receive streams into separate files by @marten-seemann in #326
• reject stream writes while sending stream headers asynchronously by @marten-seemann in #328
• ci: run tests with race detector, fix race condition in test by @marten-seemann in #334
• ci: bump actions/setup-python from 6 to 7 by @dependabot[bot] in #336
• ci: bump actions/setup-go from 6 to 7 by @dependabot[bot] in #335
• split up unit and integration tests by @marten-seemann in #337
• README: add MediaMTX, any-sync and socket.io to notable users by @marten-seemann in #338
• README: update to draft-16 by @marten-seemann in #339
• update quic-go to v0.61.0, use the new capsule API by @marten-seemann in #323
• track total data sent on a WebTransport session by @marten-seemann in #329
• implement sending of WT_DATA_BLOCKED capsules by @marten-seemann in #331
• implement handling of WT_MAX_DATA capsules by @marten-seemann in #332
• implement sending of WT_MAX_DATA capsules by @marten-seemann in #333
• add data flow control to the Config, add an integration test by @marten-seemann in #340
• reject pooled sessions without flow control by @marten-seemann in #342
• rename the Dialer to Transport by @marten-seemann in #343
• introduce a ClientConn, make it possible to pool sessions by @marten-seemann in #344
• watch for connection closure while waiting for SETTINGS by @marten-seemann in #346
• expose QUIC stream IDs on WebTransport streams by @marten-seemann in #347
• ci: use deterministic Chrome versions for interop test by @marten-seemann in #350
• check server QUIC capabilities when dialing by @marten-seemann in #351
• ci: don’t cancel interop Docker image builds on master by @marten-seemann in #352
• ci: update ChromeDriver to 151.0.7922.47 for interop test by @marten-seemann in #349
• ci: bump docker/login-action from 4.4.0 to 4.5.1 by @dependabot[bot] in #354
• add an integration test for session pooling by @marten-seemann in #353

New Contributors

• @ItalyPaleAle made their first contribution in #295

Full Changelog: v0.11.0...v0.12.0