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Faster generated headers enumeration for HTTP/2 and HTTP/3 #33352

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@benaadams has a PR that improves writing response headers for HTTP/1.1:
#32337

The same concept can be applied to response headers generated Enumerator types. These are used when writing HTTP/2 and HTTP/3.

Writing response headers in HTTP/2 is a hotspot. Multiplexing and HPack means that only one response on a connection can write headers at a time while other responses wait on a lock. Reducing the time in the lock is huge.

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HTTP2HTTP3Perfarea-networkingIncludes servers, yarp, json patch, bedrock, websockets, http client factory, and http abstractionsenhancementThis issue represents an ask for new feature or an enhancement to an existing one

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