Complete streaming and compression across adapters #107

Description

Track the remaining portable streaming and automatic request/response compression work across the supported adapters.

Core streaming bodies and Cloudflare response streaming exist. Standard Fastly, Axum and Spin response paths still collect bodies; shared gzip/Brotli helpers decode upstream responses but do not provide the complete request/response middleware and negotiation scope.

Steps to reproduce

1. Inspect the adapter streaming matrix and response converters on the pinned main revision.
2. Compare the compression helpers and proxy decode paths with the child issues below.

Expected behavior

Applications can stream through each supported runtime and configure automatic compression/decompression with consistent body/header semantics.

Impact

Large or long-lived responses remain buffered on several runtimes, and applications must supply missing compression policy themselves.

Proposed fix

Use this epic to track the unfinished child scopes; retain the completed Cloudflare/core primitives as delivered baseline. Coordinate transport changes with #275 and delivery compression with #362 without treating either as the whole epic.

Done when

• Progressive response delivery is supported and verified on all supported adapters, including bounded backpressure and terminal errors.
• Automatic response compression, request decompression and encoded pass-through have documented, tested behavior.
• Child scopes Stream Fastly standard responses progressively #109, Automatically compress responses from Accept-Encoding #111, Add request decompression middleware #112 and Preserve pre-compressed upstream responses #113 are accepted; delivered Stream Cloudflare responses without full buffering #108 and Provide a core streaming response helper #110 remain recorded.

Related

• Children: Stream Cloudflare responses without full buffering #108, Stream Fastly standard responses progressively #109, Provide a core streaming response helper #110, Automatically compress responses from Accept-Encoding #111, Add request decompression middleware #112, Preserve pre-compressed upstream responses #113.
• Axum streaming acceptance: Axum: preserve incremental streaming with bounded backpressure #394.
• Documented streaming boundaries
• Existing gzip and Brotli decoders
• Related PR feat: implement portable outbound HTTP and request lifecycle contracts #275; this PR alone does not establish completion of this issue.
• Related PR Add explicit adapter delivery compression support #452; this PR alone does not establish completion of this issue.