Reactor Netty 1.4.0-M2 is part of 2026.0.0-M2 Release Train.

What's Changed

⚠️ Update considerations and deprecations

• Remove deprecated SslProvider$SslContextSpec#sslContext(SslProvider$ProtocolSslContextSpec) by @violetagg in #4376
• Parse the standard Forwarded header directly by @violetagg in #4386

✨ New features and improvements

• Depend on Netty v4.2.18.Final by @violetagg in #4375
• Depend on Micrometer v1.18.0-M2 by @violetagg in 0a551c4
• Depend on Micrometer Tracing v1.8.0-M2 by @violetagg in 0a551c4
• Extend HttpCompressionOptionsSpec with the ability to specify desired maxPipelineDepth by @reta in #4338
• Expose connection lifetime to custom MeterRegistrar by @caiges in #4368
• Refactor WebSocket HTTP/2 handshake request creation by @violetagg in #4374
• Extend HttpServerConfig with the ability to specify desired maxPipelineDepth by @reta in #4380
• Make connections lifetime available to the built-in Micrometer integration by @violetagg in #4382

🐞 Bug fixes

• Resume the read when the pipelined queue drains without a request by @knutwannheden in #4347
• Parse one-digit ports in HttpClient String URIs by @kalayciburak in #4362
• Ensure websocket handshake error is not swallowed by @violetagg in #4372

📖 Documentation

• Add a WebSocket echo client example by @anjeongkyun in #4346

New Contributors

• @anjeongkyun made their first contribution in #4346
• @knutwannheden made their first contribution in #4347
• @kalayciburak made their first contribution in #4362
• @caiges made their first contribution in #4368
• @mbhave made their first contribution in #4373

Full Changelog: v1.4.0-M1...v1.4.0-M2

Reactor Netty 1.4.0-M1 is part of 2026.0.0-M1 Release Train.

What's Changed

⚠️ Update considerations and deprecations

• Require choice between Forwarded and X-Forwarded headers by @violetagg in #4312

✨ New features and improvements

• Depend on Reactor Core v3.8.7 by @violetagg in 79ef2f6, see release notes
• Depend on Netty v4.2.17.Final by @violetagg in #4324
• Depend on Micrometer v1.18.0-M1 by @violetagg in 0b9436b
• Depend on Micrometer Tracing v1.8.0-M1 by @violetagg in 0b9436b
• Add WebSocket client metrics by @LivingLikeKrillin in #4118
• Expose pending acquire latencies to custom MeterRegistrar by @ejhnsn in #4250
• Reduce per-request CPU in the HTTP/2 connection pool by @samueldlightfoot in #4297
• Evaluate the address supplier once in AddressUtils.updatePort by @samueldlightfoot in #4298
• Reuse per-connection address and byte meters in the Micrometer client metrics path by @samueldlightfoot in #4318
• Override isH2cUpgrade in Http3Pool to always return false by @violetagg in #4325
• Drop the redundant address parameter from the HttpClient recordRead/recordWrite/startWrite by @violetagg in #4327
• HttpClient: Add API for configuring max decompression buffer size by @violetagg in e413ce9
• Ensure NonSslRedirectHandler always does a redirect based on HOST header by @violetagg in 7bd2f47
• WebSocket: Add API for configuring max decompression buffer size by @violetagg in d735cd1

🐞 Bug fixes

• Exclude HTTP/2 connections from the pool during the PING liveness check by @LivingLikeKrillin in #4255
• Add the liveness check to Http11EvictionPredicate by @LivingLikeKrillin in #4256
• Skip SNI lookup completion when the channel is already closed by @violetagg in #4266
• Do not capture caller context into pool maintenance tasks by @hocaron in #4300
• Fix WebSocket-over-HTTP/2 server metrics gauge accounting on close by @LivingLikeKrillin in #4302
• Fix NameResolverProvider#equals/hashCode by @violetagg in 5c19b57
• Refactor TracingMapHandle to handle exceptions correctly by @violetagg in 8e63e56
• Update proxy handling by @violetagg in 99365a5
• Refine header handling during redirects by @violetagg in 53e42cf
• Add back-pressure on pipelined HTTP requests by @violetagg in 38cd84c
• Proxy protocol is not supported for HTTP/3 protocol by @violetagg in afb3652

📖 Documentation

• Update javadoc for http-to-https redirect by @violetagg in ac607b0

New Contributors

• @LivingLikeKrillin made their first contribution in #4118
• @ejhnsn made their first contribution in #4250
• @hocaron made their first contribution in #4300

Full Changelog: v1.3.6...v1.4.0-M1

Reactor Netty 1.3.7 is part of 2025.0.7 Release Train.

What's Changed

✨ New features and improvements

• Depend on Reactor Core v3.8.7 by @violetagg in b0395be, see release notes
• Depend on Netty v4.2.17.Final by @violetagg in #4324
• Add WebSocket client metrics by @LivingLikeKrillin in #4118
• Expose pending acquire latencies to custom MeterRegistrar by @ejhnsn in #4250
• Reduce per-request CPU in the HTTP/2 connection pool by @samueldlightfoot in #4297
• Evaluate the address supplier once in AddressUtils.updatePort by @samueldlightfoot in #4298
• Require choice between Forwarded and X-Forwarded headers by @violetagg in #4312
• Reuse per-connection address and byte meters in the Micrometer client metrics path by @samueldlightfoot in #4318
• Override isH2cUpgrade in Http3Pool to always return false by @violetagg in #4325
• Drop the redundant address parameter from the HttpClient recordRead/recordWrite/startWrite by @violetagg in #4327
• HttpClient: Add API for configuring max decompression buffer size by @violetagg in f4ca645
• Ensure NonSslRedirectHandler always does a redirect based on HOST header by @violetagg in 626a6e7
• WebSocket: Add API for configuring max decompression buffer size by @violetagg in 6908378

🐞 Bug fixes

• Exclude HTTP/2 connections from the pool during the PING liveness check by @LivingLikeKrillin in #4255
• Add the liveness check to Http11EvictionPredicate by @LivingLikeKrillin in #4256
• Skip SNI lookup completion when the channel is already closed by @violetagg in #4266
• Do not capture caller context into pool maintenance tasks by @hocaron in #4300
• Fix WebSocket-over-HTTP/2 server metrics gauge accounting on close by @LivingLikeKrillin in #4302
• Fix NameResolverProvider#equals/hashCode by @violetagg in 717381b
• Refactor TracingMapHandle to handle exceptions correctly by @violetagg in 68561f4
• Update proxy handling by @violetagg in fc98328
• Refine header handling during redirects by @violetagg in 88adf0c
• Add back-pressure on pipelined HTTP requests by @violetagg in dc07b92
• Proxy protocol is not supported for HTTP/3 protocol by @violetagg in 8d37581

📖 Documentation

• Update javadoc for http-to-https redirect by @violetagg in 74a5524

New Contributors

• @LivingLikeKrillin made their first contribution in #4118
• @ejhnsn made their first contribution in #4250
• @hocaron made their first contribution in #4300

Full Changelog: v1.3.6...v1.3.7

Reactor Netty 1.3.6 is part of 2025.0.6 Release Train.

What's Changed

⚠️ Update considerations and deprecations

• Tweak DNS resolver channel allocation strategy by @violetagg in #4230

✨ New features and improvements

• Depend on Reactor Core v3.8.6 by @violetagg in 511a3b6, see release notes
• Depend on Netty v4.2.15.Final by @violetagg in #4237
• Remove multipart exception from isSelfDefinedMessageLength for keep-alive by @violetagg in #4200
• Store HTTP/2 websocket CONNECT :protocol/:path in channel attributes by @violetagg in #4202
• Update HTTP/3 configuration by @violetagg in 1a4c422

🐞 Bug fixes

• Fix keep-alive race when creating HttpServerOperations by @koisyu in #4189
• Fix HTTP/3 connection pool drain when server replenishes streams to same level by @violetagg in #4193
• Fix missing metrics for AdaptiveByteBufAllocator by @lukas-riedler-dynatrace in #4217
• Throw DecoderException with hostname when SNI AsyncMapping resolves to null by @kwondh5217 in #4212
• Refine header handling during redirects by @violetagg in e7ef551

📖 Documentation

• Add WebSocket echo server example by @Yelagandula in #4177
• Document TCP/UDP metrics remote.address tag cardinality by @violetagg in #4201

New Contributors

• @koisyu made their first contribution in #4189
• @Yelagandula made their first contribution in #4177
• @lukas-riedler-dynatrace made their first contribution in #4217
• @kwondh5217 made their first contribution in #4212

Full Changelog: v1.3.5...v1.3.6

Reactor Netty 1.2.18 is part of 2024.0.18 Release Train.
This is the last release of 1.2.x, as 2024.0.x Release Train is going out of OSS support. For the next steps, check our support policy.

What's Changed

⚠️ Update considerations and deprecations

• Tweak DNS resolver channel allocation strategy by @violetagg in #4230

✨ New features and improvements

• Depend on Reactor Core v3.7.19 by @violetagg in c753da4, see release notes
• Depend on Netty v4.1.135.Final by @violetagg in #4240
• Store HTTP/2 websocket CONNECT :protocol/:path in channel attributes by @violetagg in #4202

🐞 Bug fixes

• Fix keep-alive race when creating HttpServerOperations by @koisyu in #4189
• Throw DecoderException with hostname when SNI AsyncMapping resolves to null by @kwondh5217 in #4212
• Refine header handling during redirects by @violetagg in e7ef551

New Contributors

• @koisyu made their first contribution in #4189
• @kwondh5217 made their first contribution in #4212

Full Changelog: v1.2.17...v1.2.18

Reactor Netty 1.3.5 is part of 2025.0.5 Release Train.

What's Changed

✨ New features and improvements

• Depend on Reactor Core v3.8.5 by @violetagg in b68daca, see release notes
• Depend on Netty v4.2.12.Final by @violetagg in #4167
• Depend on Netty QUIC Codec v0.0.75.Final by @violetagg in #4148
• Depend on Brave v6.3.1 by @dependabot[bot] in #4159
• Optimise uri construction with baseUrl in HttpClientHandler by @violetagg in #4130
• Optimise UriEndpoint#toSocketAddressStringWithoutDefaultPort by @violetagg in #4131
• Store resolved SocketAddress in UriEndpoint for absolute URLs by @violetagg in #4132
• Lazily compute HttpClientOperations#resourceUrl by @violetagg in #4135
• Pre-compute path in UriEndpoint when URI is provided by @violetagg in #4136
• Cleanup HTTP/2 WebSocket extension handlers by @violetagg in #4152
• Optimise Flux body accumulation for GET/HEAD/DELETE requests by @violetagg in #4164
• Fix HTTP/3 connection pool max streams handling by @violetagg in #4182

🐞 Bug fixes

• Ensure connection concurrency and acquired counters are updated before delivering the slot by @violetagg in #4179
• Fix StackOverflowError in ServerTransport graceful shutdown by @violetagg in #4181
• Fix invalidated connection reuse in Http2Pool by @violetagg in #4180

New Contributors

• @Junuu made their first contribution in #4137

Full Changelog: v1.3.4...v1.3.5

Reactor Netty 1.2.17 is part of 2024.0.17 Release Train.

What's Changed

✨ New features and improvements

• Depend on Reactor Core v3.7.18 by @violetagg in 9f6f3e0, see release notes
• Depend on Netty v4.1.132.Final by @violetagg in #4162
• Depend on Netty QUIC Codec v0.0.75.Final by @violetagg in #4148
• Optimise uri construction with baseUrl in HttpClientHandler by @violetagg in #4130
• Optimise UriEndpoint#toSocketAddressStringWithoutDefaultPort by @violetagg in #4131
• Store resolved SocketAddress in UriEndpoint for absolute URLs by @violetagg in #4132
• Lazily compute HttpClientOperations#resourceUrl by @violetagg in #4135
• Pre-compute path in UriEndpoint when URI is provided by @violetagg in #4136
• Cleanup HTTP/2 WebSocket extension handlers by @violetagg in #4152

🐞 Bug fixes

• Fix StackOverflowError in ServerTransport graceful shutdown by @violetagg in #4181

Full Changelog: v1.2.16...v1.2.17

Reactor Netty 1.3.4 is part of 2025.0.4 Release Train.

What's Changed

✨ New features and improvements

• Depend on Reactor Core v3.8.4 by @chemicL in 53e8319, see release notes
• Avoid DefaultChannelId generation for DisposedChannel by @violetagg in #4095
• Push-based maxConcurrentStreams update via SETTINGS frame handler by @violetagg in #4106
• Add configurable maxLifeTime with per-resource variance by @violetagg in #4111
• Add Http2AllocationStrategy#streamBatchSize for batched stream dispatching by @violetagg in #4114
• Override isSharable() explicitly to avoid annotation lookup by @violetagg in #4120
• Add fast-path short-circuit for is100ContinueExpected check by @violetagg in #4123
• Cache resolved HttpHeadersFactory instances to avoid repeated allocation by @violetagg in #4124

🐞 Bug fixes

• Add FlushConsolidationHandler to H2C upgrade pipeline by @violetagg in #4097
• Fix Http2Pool returning connection to the pool before H2C upgrade completes by @violetagg in #4098
• Fix Http2Pool ACQUIRED counter not rolled back when deliver is rejected by @violetagg in #4099
• Fix HttpClient#proxyWhen to use NoopAddressResolverGroup by @violetagg in #4104

Full Changelog: v1.3.3...v1.3.4

Reactor Netty 1.2.16 is part of 2024.0.16 Release Train.

What's Changed

✨ New features and improvements

• Depend on Reactor Core v3.7.17 by @chemicL in 98eb271, see release notes
• Override isSharable() explicitly to avoid annotation lookup by @violetagg in #4120
• Add fast-path short-circuit for is100ContinueExpected check by @violetagg in #4123
• Cache resolved HttpHeadersFactory instances to avoid repeated allocation by @violetagg in #4124

🐞 Bug fixes

• Add FlushConsolidationHandler to H2C upgrade pipeline by @violetagg in #4097
• Fix HttpClient#proxyWhen to use NoopAddressResolverGroup by @violetagg in #4104

Full Changelog: v1.2.15...v1.2.16

Reactor Netty 1.3.3 is part of 2025.0.3 Release Train.

What's Changed

✨ New features and improvements

• Depend on Reactor Core v3.8.3 by @violetagg in 0e5b351, see release notes
• Depend on Netty v4.2.10.Final by @violetagg in #4091
• Improve Http2Pool connection reuse for concurrent acquires by @zimatars in #4051
• Refactor Http2Pool max concurrent streams calculation by @violetagg in #4061
• Remove deprecated EventLoopGroup checks from supportGroup() by @violetagg in #4084
• Optimise HttpServerRequest#timestamp by using Instant internally with lazy ZonedDateTime conversion by @violetagg in #4090

🐞 Bug fixes

• Fix race condition in pending acquire timer management by @violetagg in #4073
• Fix incorrect channel factory selection for custom EventLoopGroups by @j-bahr in #4074

📖 Documentation

• Add Http2AllocationStrategy documentation and improve javadoc by @violetagg in #4093

Full Changelog: v1.3.2...v1.3.3