Fix - Http3FrameCodec decode fail during unknown settings#361
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normanmaurer merged 1 commit intomainfrom Feb 18, 2026
Merged
Fix - Http3FrameCodec decode fail during unknown settings#361normanmaurer merged 1 commit intomainfrom
normanmaurer merged 1 commit intomainfrom
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**Motivation:** The change in [https://github.com/netty/netty/pull/15909](https://github.com/netty/netty/pull/15909) is merged but not yet released. While working on HTTP/3 connections I noticed a logical issue: when an unknown settings key is received, the current implementation returns a value, which causes Http3FrameCodec to treat it as an error (because settings.put(key, value) returns the previous value for known keys and null for new ones). For unknown keys we should ignore them, so we now always return null to achieve the expected behavior. **Modification:** * [x] settings.put(key, value) now returns null for unknown keys (non null triggers an error in Http3FrameCodec decoding). * [x] Added unit tests to verify this. > Note: Http3CodecTest didn’t catch the issue previously because it used frames produced by the same put logic, so both encoding and decoding behaved consistently and the issue was hidden. Port of netty/netty#15998
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Motivation:
The change in
netty/netty#15909 is merged but not yet released. While working on HTTP/3 connections I noticed a logical issue: when an unknown settings key is received, the current implementation returns a value, which causes Http3FrameCodec to treat it as an error (because settings.put(key, value) returns the previous value for known keys and null for new ones). For unknown keys we should ignore them, so we now always return null to achieve the expected behavior.
Modification:
settings.put(key, value) now returns null for unknown keys (non null triggers an error in Http3FrameCodec decoding).
Added unit tests to verify this.
Port of netty/netty#15998