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Set default maxFieldSectionSize to 16MB (#16088) - #355
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Long.MAX_VALUE cannot be encoded as a valid QUIC varint (only 62 value bits are usable, so Max can be 2^62-1 but JAVA Long MAX = 2^63-1), which can cause HTTP/3/WebTransport negotiation failures. A large but bounded default is safer and more compatible across implementations. as per [RFC9000](https://datatracker.ietf.org/doc/html/rfc9000?#name-variable-length-integer-enc) <img width="400" height="300" alt="Screenshot 2025-12-26 at 12 29 19 AM" src="https://github.com/user-attachments/assets/535048fd-1893-4ffd-bc9e-46c9d802e189" /> Changed default maxFieldSectionSize from Long.MAX_VALUE to 16 * 1024 * 1024 (16MB). Result Fixes #16087 Uses a QUIC-compliant value and prevents failures during SETTINGS exchange with peers. > Note : This did not affect any flow uses `new Http3Settings() `only if implementations use `Http3Settings.defaultSettings()` Result: Port of netty/netty#16088
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Long.MAX_VALUE cannot be encoded as a valid QUIC varint (only 62 value bits are usable, so Max can be 2^62-1 but JAVA Long MAX = 2^63-1), which can cause HTTP/3/WebTransport negotiation failures. A large but bounded default is safer and more compatible across implementations. as per
RFC9000
Changed default maxFieldSectionSize from Long.MAX_VALUE to 16 * 1024 * 1024 (16MB).
Result
Fixes #16087
Uses a QUIC-compliant value and prevents failures during SETTINGS exchange with peers.
Result:
Port of netty/netty#16088