quest: JS lite fetch waits for the publisher's answer - #4175
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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MERGE Positive improvement: yes. This closes the JS parity gap left by #4164. Rust lite FETCH already waits for the publisher’s answer and surfaces Worth the complexity: yes. The quest is small and concrete. It names both halves (subscriber settles on first byte / FIN and rejects on reset; publisher miss uses Different approach: folding the JS change into #4164 was considered and correctly rejected so the Rust fix can land alone. An implementation PR without a quest would skip the planning convention this tree uses; the quest is the right artifact. One nit for the implementer later: confirm whether coalesced callers already share one in-flight promise in Docs-only, clear goal, clear plan. Ship it. This is an automated review, not the maintainer's decision |
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| coalesced second caller rejects too, an existing group is unchanged, and a | ||
| JS publisher's miss reaches a subscriber as `NotFound`. | ||
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| Public API: none; a behavior change in when `fetchGroup` settles. Wire: none. |
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The plan explicitly changes the FETCH stream reset from a generic code to NotFound, which is wire-visible and is what lets a Rust peer distinguish a miss from another failure. Declaring Wire: none understates the change and can cause the implementation to skip the required wire-impact and interop assessment; describe the reset-code behavior here instead.
AGENTS.md reference: AGENTS.md:L58-L58
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughAdds an m1 quest entry and a plan for JS lite fetch behavior. The plan states that fetch settles after the first response byte or an empty-group FIN, and rejects on reset. It describes the current fetch path as returning before the response arrives. It also specifies that a publisher miss uses the existing Priority: ⬇️ Low Merge Risk: ⚪ Minimal · up to The quest documents planned JS fetch behavior; no actionable merge blocker is established for this change. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 1 system. Changed systems: Architecture concerns Review detailsSystems and components
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Inline comments:
In `@quest/m1/js-fetch-answer.md`:
- Line 16: Update the subscriber fetch-path description in the plan to reflect
that lite fetchGroup resolves after the first response byte or an empty-group
FIN, and rejects on reset; remove the claim that it returns its mirror before
the response arrives.
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quest/m1/README.mdquest/m1/js-fetch-answer.md
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The plan said to mirror Rust, then described today's early return. Resolve after the first byte or an empty-group FIN. A miss uses the existing NotFound code; that is not a wire format change.
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Landing the JS lite fetch quest. The plan now states that wait instead of today's early return, and notes the reset is not a wire format change. (Written by Grok 4.7) |
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| coalesced second caller rejects too, an existing group is unchanged, and a | ||
| JS publisher's miss reaches a subscriber as `NotFound`. | ||
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| Public API: none; a behavior change in when `fetchGroup` settles. Wire: no |
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Consumer.fetchGroup() is exported in js/net/src/track.ts, and changing when its promise settles and where a missing-group error surfaces changes its observable contract. Labeling the public API impact as none can cause the implementation to skip the required API-impact assessment; describe this as a behavioral public API change instead. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L53-L58
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Problem
#4164 made Rust's lite FETCH wait for the publisher's answer, but
js/netstill resolvesfetchGroupbefore the publisher replies. A missing group therefore only fails on the firstreadFrame(), and a JS publisher's miss resets with a generic code instead ofNotFound.Approach
Adds
quest/m1/js-fetch-answer.md[S], ranked right after Missing fetch group. It covers both the subscriber half (settle on the first byte or FIN, reject on reset) and the publisher half (NotFoundon a miss).Impact
Alternatives
Follow-ups
(Written by Claude Opus 5.5)
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