[rkaplan-hub]

Large filtered upload chunks currently have one release point, so an application cannot pace bounded portions at the upstream writer or retain ownership until those bytes are accepted.

Add an optional ProxyHttp::request_body_pacer hook returning an owned RequestBodyPacer. HTTP/1 retains it in the request pipe and admits prefixes while continuing to poll upstream responses. HTTP/2 admits prefixes at its DATA writer. Both paths preserve the final end marker and settle accepted payload on errors or cancellation.

Add an opt-in HTTP/1 controlled writer and HTTP/2 accepted-DATA counters so partial progress survives interrupted writes, excluding HTTP framing. The default pacing hook returns None.

This supports praxis-proxy/praxis#124 and the runtime/integration work in praxis-proxy/praxis#1510 and rkaplan-hub/praxis#1. Praxis pins the exact fork revision until this API is released.

Validation:

• 81 standalone proxy unit tests passed with Rustls, including bounded-prefix/EOS handling, cancelled admission, and reading an early upstream response while upload admission waits.
• Four focused core tests passed: partial content-length/chunked writes, flush failure, cancellation-safe client counters, and HTTP/2 DATA progress before timeout.
• Praxis integration with the exact source pin passed 18 live bandwidth tests on Pingora, including oversized upload prefixes, HTTP/2 upstream uploads, compression, sharing, resets, and the HTTP/TCP example.
• 877 Praxis protocol unit tests passed (two existing tests ignored). Runtime checks passed: 60 bandwidth tests, 107 callout tests, and controlled uploads on both network backends.
• Praxis strict checks passed for the Pingora transport and protocol, with bandwidth enabled and disabled. Pinned-nightly formatting passes.

[coderabbitai]

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