netty: Support never-indexed metadata keys - #12976
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Add NettyChannelBuilder.neverIndexMetadataKey() and neverIndexMetadataKeys() so callers can mark selected outbound metadata keys for HPACK's never-indexed literal representation. High-cardinality metadata values provide little compression benefit and can churn the server's dynamic HPACK table. Keeping them out of the table avoids unnecessary insertion and eviction work while preserving dynamic indexing for other headers. Propagate an immutable set of normalized metadata names through the client transport and use it in Netty's HPACK sensitivity detector. Add unit and interoperability coverage. Generated with AI using OpenAI Codex (GPT-5).
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Add NettyChannelBuilder.neverIndexMetadataKey() and neverIndexMetadataKeys() so callers can mark selected outbound metadata keys for HPACK's never-indexed literal representation.
High-cardinality metadata values provide little compression benefit and can churn the server's dynamic HPACK table. Keeping them out of the table avoids unnecessary insertion and eviction work while preserving dynamic indexing for other headers.
Propagate an immutable set of normalized metadata names through the client transport and use it in Netty's HPACK sensitivity detector. Add unit and interoperability coverage.
Generated with AI using OpenAI Codex (GPT-5).