v0.11.0

This release focuses on full compatibility with draft-15. The server keeps limited backwards compatibility with older draft clients where this is straightforward, but that compatibility is intentionally not comprehensive.

WebTransport flow control is not supported yet (see issue #256).

Breaking Changes

• webtransport-go now requires Go 1.25 or newer: #243

Protocol Changes

• Use SETTINGS_WT_ENABLED for WebTransport draft-version negotiation. The server continues to accept the old ENABLE_WEBTRANSPORT setting for compatibility with older clients: #254
• Send SETTINGS_WT_ENABLED from the client, as required by draft-15: #271 (thanks to @tobbee)
• Use webtransport-h3 as the Extended CONNECT :protocol token. The server continues to accept the legacy webtransport token for compatibility with older clients: #280 (thanks to @tomholford)
• Use the WT_REQUIREMENTS_NOT_MET error when the peer does not advertise the required HTTP/3 or WebTransport capabilities: #252
• Add support for the WT_ALPN_ERROR session error: #277
• Validate WebTransport session IDs before accepting incoming streams: #283
• Advertise SETTINGS values as required by Safari 26.4: #261 (thanks to @birros)

New Features

• Added a runnable example server and client, including browser-side JavaScript and certificate hash verification in the Go client: #285

Notable Fixes

• Fixed a stream close race condition where ReceiveStream.Read or SendStream.Write could block forever when the local and remote side closed a session concurrently: #267 (thanks to @aler9)
• Server.ListenAndServe now closes the UDP socket it creates: #274

What's Changed

• update to Go 1.26, drop Go 1.24 by @marten-seemann in #243
• build an image for the WebTransport Interop Runner by @marten-seemann in #244
• Bump docker/setup-buildx-action from 3 to 4 by @dependabot[bot] in #249
• Bump docker/build-push-action from 6 to 7 by @dependabot[bot] in #250
• Bump docker/login-action from 3 to 4 by @dependabot[bot] in #251
• Bump docker/setup-qemu-action from 3 to 4 by @dependabot[bot] in #248
• use the WT_REQUIREMENTS_NOT_MET error by @marten-seemann in #252
• use SETTINGS_WT_ENABLED introduced in draft-15 by @marten-seemann in #254
• ci: bump codecov/codecov-action from 5 to 6 by @dependabot[bot] in #260
• ci: bump nanasess/setup-chromedriver from 2 to 3 by @dependabot[bot] in #266
• ci: bump codecov/codecov-action from 6 to 7 by @dependabot[bot] in #268
• ci: pin non-GitHub-owned GitHub Actions by @marten-seemann in #270
• README: update to draft-15 by @marten-seemann in #273
• send SETTINGS_WT_ENABLED from the client by @tobbee in #271
• close UDP socket created by Server.ListenAndServe by @marten-seemann in #274
• run go fix across the entire codebase by @marten-seemann in #275
• ci: run go fix as part of the lint workflow by @marten-seemann in #276
• add support for the WT_ALPN_ERROR by @marten-seemann in #277
• fix stream close race condition on session close by @aler9 in #267
• fix flaky TestDatagrams by @marten-seemann in #278
• use webtransport-h3 as the :protocol upgrade token by @tomholford in #280
• implement validation of session IDs by @marten-seemann in #283
• add an example server and client by @marten-seemann in #285
• send WebTransport SETTINGS expected by Safari 26.4 by @birros in #261
• update quic-go to v0.60.0 by @marten-seemann in #287

New Contributors

• @tobbee made their first contribution in #271
• @aler9 made their first contribution in #267
• @tomholford made their first contribution in #280
• @birros made their first contribution in #261

Full Changelog: v0.10.0...v0.11.0