v1.3.0

Reactor Netty 1.3.0 is part of 2025.0.0 Release Train.

1.3.0 Highlights

🎯 Major Upgrades

Netty 4.2

Built on the latest Netty 4.2, bringing the latest networking capabilities and performance improvements.

🎓 Graduated Features

HTTP/3 support

Reactor Netty HTTP/3 support is now production-ready.

QUIC support

Reactor Netty QUIC support is now production-ready.

IO_Uring support

Reactor Netty IO_Uring support is now production-ready.

• Reactor Netty default transport (Linux): Epoll (included out-of-the-box)
• Reactor Netty IO_Uring support: Available via explicit dependency: io.netty:netty-transport-native-io_uring
• Requirements: JDK 11+

🔍 Enhanced Null Safety using JSpecify

Migrated to JSpecify annotations for nullability constraints.

For detailed information and code examples, visit our documentation.

What's Changed

⚠️ Update considerations and deprecations

• Ensure POST empty body sending content-length 0 by @violetagg in #3663
• Ensure HttpClient does not add Content-Length header when GET/HEAD/DELETE and the send Publisher does not provide content by @violetagg in #3664

✨ New features and improvements

• Depend on Reactor Core v3.8.0 by @violetagg in 586257f, see release notes
• Depend on Netty v4.2.7.Final by @violetagg in #3971
  • Adapt to SocketProtocolFamily by @violetagg in #3766
  • Adapt to IoEventLoopGroup by @violetagg in #3767
  • Graduate reactor-netty-incubator-quic to reactor-netty-quic by @violetagg in #3768
  • IO_Uring is now part of Netty by @violetagg in #3705 and by @j-bahr in #3974
  • Reactor Netty HTTP/3 support is no more in incubation by @violetagg in #3851, #3996
• Depend on Micrometer v1.16.0 by @violetagg in #3997
• Depend on Micrometer Tracing v1.6.0 by @violetagg in #3997
• Depend on Context Propagation v1.2.0 by @violetagg in #3997
• Depend on Brave v6.3.0 by @dependabot in #3786
• Migrate to JSpecify annotations for nullability constraints by @violetagg in #3630, #3640, #3641, #3642, #3644, #3645, #3647, #3665, #3694, #3707, #3708, #3709, #3933, #3934, #3995, 8b148ce, ee5ac40
• Add HttpMeterRegistrarAdapter to track active streams in HTTP/2 and HTTP/3 by @raccoonback in #3632
• Move log statement to the correct place by @violetagg in #3674
• Add API for determining the resolved addresses to which this client should connect by @violetagg in #3687
• Support websocket over HTTP/2 by @violetagg in #3691 and #3715
• Enable set up TcpResources default max connection by setting by @lcamhoa in #3712
• Make AccessLog class not final by @dmitrysulman in #3726
• Add request and response header iterators to AccessLogArgProvider by @dmitrysulman in #3735
• Support error log handler for Http server by @raccoonback in #3700 and by @violetagg in 4ed2380 and #3750
• Remove unused method parameter by @violetagg in #3751
• Remove the usage of deprecated functionality by @violetagg in #3792
• Use the new Netty HTTP/2 setting SETTINGS_ENABLE_CONNECT_PROTOCOL by @violetagg in #3794
• Remove the usage of deprecated functionality by @violetagg in #3819
• Improve protocol validation in Forwarded/X-Forwarded-Proto header parsing by @violetagg in #3823 and #3824
• Remove trailer header pre-declaration requirement by @violetagg in #3825
• Support Proxy-Authorization renewal by @violetagg in #3925
• Add API for configuring maximum number RST frames that are allowed per window by @violetagg in #3931
• Preserve exception cause in ChannelBindException by @violetagg in #3976
• Add HTTP/2 PING-based connection health checks by @violetagg in #3980
• Allow setting .pendingAcquireMaxCount() to zero in ConnectionProvider by @Martin7-1 in #3987

🐞 Bug fixes

• Fix various issues with Nullable annotation by @violetagg in #3626, #3628, #3629, #3646
• Fix NullPointerException in Http2SettingsSpec#hashCode by @violetagg in #3639
• Fix Http2ConnectionProvider#logStreamsState to log active/max streams per connection and per all connections by @violetagg in #3650
• Ensure the HTTP/2 stream is closed when an error happens before send operation by @violetagg in #3675
• Ensure the HTTP/3 stream is closed when an error happens before send operation by @violetagg in #3677
• Ensure the connection is invalidated when an error happens before h2c upgrade operation by @violetagg in #3678
• Ensure HttpInfos#version returns the correct protocol when Unix Domain Sockets by @violetagg in #3693
• Ensure reactor.netty.http.server.connections.active is updated when there is no HttpServerOperations by @violetagg in #3725
• Ensure the default compression configuration is taken from Netty by @violetagg in #3743
• Ensure the exception is propagated in case of delayed address resolution by @violetagg in #3744
• Release the partial HttpData only if it is not released by Netty by @violetagg in #3749
• Connection pools with/without resolvedAddressesSelector are different pools by @violetagg in #3753
• Remove extra write invocation when Expect: 100-continue by @violetagg in #3755
• Ensure the connection is invalidated when a connection close happens before HTTP/1.1 to HTTP/2 upgrade operation by @violetagg in #3806
• When HTTP/2 apply always the trailer headers by @violetagg in #3808
• Trailers must not include pseudo-header fields by @violetagg in #3810
• Add the HTTP/2 connection to the channel group for a proper graceful shutdown in case no active streams by @violetagg in #3827
• Add proper initialisation of maxConcurrentStreams when successful HTTP/1.1 to HTTP/2 upgrade by @violetagg in #3832
• Ensure the HTTP/2 upgrade stream inherits the proper state from the original HTTP/1.1 connection when successful upgrade from HTTP/1.1 to HTTP/2 by @violetagg in #3838
• When HTTP/2, ensure the trailer headers are provided in case full response is received by @violetagg in #3847
• Ensure HttpClientResponse#trailerHeaders always completes by @violetagg in #3848
• Fix message for handlerConfigurator by @klopfdreh in #3861
• Ensure both resolved and unresolved server bind addresses are used with ConnectionProvider#disposeWhen by @violetagg in #3881
• Ensure 100-Continue is handled when collecting client's metrics by @violetagg in #3895
• Ensure cookie validation errors are propagated by @violetagg in #3898
• Ensure ResponseTimeoutHandler is added as one of the first handlers in the pipeline by @violetagg in #3916
• Add missing check for null by @violetagg in #3932
• Do not try to send the file when Content-Length:0 by @violetagg in #3936
• Ensure the HTTP/2 upgrade stream inherits the proper state from the original HTTP/1.1 connection when successful upgrade from HTTP/1.1 to HTTP/2 by @violetagg in #3957
• Fix HttpClientConfig copying issue in MonoHttpConnect by @violetagg in #3964

📖 Documentation

• Add reactor-netty-quic reference documentation by @violetagg in #3775
• Add QUIC example by @violetagg in #3782
• Document the required HTTP/2 initial setting when websocket over HTTP/2 on the server by @violetagg in #3783

New Contributors

• @lcamhoa made their first contribution in #3712
• @dmitrysulman made their first contribution in #3726
• @jkonicki made their first contribution in #3829 and #3830
• @klopfdreh made their first contribution in #3861
• @Martin7-1 made their first contribution in #3987

Full Changelog from M1 version to GA version: v1.2.3...v1.3.0