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feat(providers): opt-in ZERO_RESPONSE_HEADER_TIMEOUT override for slow first-byte deployments - #1106
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…w first-byte deployments The shared HTTP transport waits at most 120s for a response header. A local model server that has to load a large model can take longer than that to produce the first byte (measured 1-5 minutes on a throttled local Ollama), so an otherwise-alive request is aborted. Add ZERO_RESPONSE_HEADER_TIMEOUT, mirroring ZERO_STREAM_IDLE_TIMEOUT: a Go duration or a bare number of seconds; "0", "off", "none" or "disabled" remove the limit; an unparseable or non-positive value falls back to the default instead of removing the limit. The default stays 120s, so nothing changes for anyone who does not set the variable. The constant and the resolver sit next to the idle-timeout equivalents in providerio. Checked against a throttled local Ollama: ZERO_RESPONSE_HEADER_TIMEOUT=5s fails at ~6.4s, =300s succeeds at ~223s (a request that would have hit the 120s ceiling). Refs Twigpine#1038 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0142QEjA7eEFcdXTpcTmcAZk
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WalkthroughThe provider I/O package now checks bare-second timeout conversions and resolves ChangesProvider timeout configuration
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Feature · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage | Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
✅ Passed checks (4 passed)
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Check name Status Explanation Linked Issues check ✅ Passed Issue [ #1038] requires an opt-in response-header timeout for slow local Ollama requests, Go-duration or bare-second values, and an unchanged 120-second default. The reviewed code applies the resolved …Out of Scope Changes check ✅ Passed The changes are limited to shared HTTP timeout handling and related tests. Overflow checks for ZERO_STREAM_IDLE_TIMEOUTprotect the same timeout parsing pattern from wrapping into a disabled watchdo…Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled. Title check ✅ Passed The title clearly describes the opt-in response-header timeout override for deployments with slow first-byte responses.
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Review comments at @internal/providers/providerio/providerio.go:
- Line 149: In the bare-seconds parsing path, validate the value against the
maximum representable time.Duration in seconds before multiplying by
time.Second; values that exceed the limit must use the existing fallback. Add
regression coverage for overflowing bare-second values.
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internal/providers/providerio/providerio.gointernal/providers/providerio/response_header_timeout_resolve_test.go
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Vasanthdev2004
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Thanks for picking this up. The env parsing matches ResolveStreamIdleTimeout line for line, the default stays at 120s, and the wiring works end to end: with ZERO_RESPONSE_HEADER_TIMEOUT=300s in the environment, the shared transport's ResponseHeaderTimeout comes out at 5m. Two test gaps before it goes in:
- Nothing pins the transport to the resolver.
TestResolveResponseHeaderTimeoutcalls the resolver directly, so puttingDefaultResponseHeaderTimeoutback on the transport still passes the whole package. TestHTTPClientReturnsStallHardenedSharedClientnow depends on the developer's shell.sharedHTTPClientis built at package init, so withZERO_RESPONSE_HEADER_TIMEOUT=300sset it fails with "ResponseHeaderTimeout = 5m0s, want 120s". On main it passes with the same variable set. The people most likely to have it set are the ones this PR is for.
One change covers both: build the client in a function the package var calls, and test that function under t.Setenv, once unset (120s) and once with an override. Having it return the idle closer's stop function lets the test clean up after itself. The existing test can then stop asserting on the init-time value.
CodeRabbit's overflow note is real, but the idle resolver on main has the same bare-seconds multiply. If you take it, one parse helper that both resolvers call would keep them identical.
CI hadn't run: both runs were waiting behind the fork gate, and I approved them after reading the diff. Requesting changes for the two tests.
A value such as 36028797018963968 passes strconv.Atoi and wraps to zero when multiplied by time.Second, which would disable the default. Values that do not fit in time.Duration stay on the default.
ResolveStreamIdleTimeout multiplied bare seconds by time.Second the same way the header timeout did, so a large count wrapped to zero and disabled the watchdog. Both resolvers now share a bounds-checked conversion.
The stall-hardened transport baked ResponseHeaderTimeout in at package init, so a later ZERO_RESPONSE_HEADER_TIMEOUT never reached the real client and the 120s check depended on the env at init. Each resolved value now keeps its own transport, and a slow header proves that transport enforces it.
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@Vasanthdev2004 — addressed in |
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@Vasanthdev2004 thanks for the review. Both test gaps are closed on the current head (
On the checklist line about The CI runs for this head are waiting behind the fork gate ( |
…ESPONSE_HEADER_TIMEOUT Replaces the first-round ef2bfb5 in fork main with the version that addresses review on Twigpine#1106: overflow-safe bare seconds, header timeout resolved when the shared client is taken (not at package init), and a test pinning the transport to the resolver. Conflicts in providerio resolved to the PR side; the directory now matches afba2dd.
Vasanthdev2004
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Re-reviewed at afba2ddd. Both gaps are closed, and the shared overflow helper keeps the two resolvers identical, which is what I was after.
- Putting
DefaultResponseHeaderTimeoutback on the transport failsTestHTTPClientTransportUsesResolvedHeaderTimeout, and so does a client cache that ignores the timeout key. - Dropping the overflow guard fails both resolvers' overflow cases, and dropping the positive-seconds check fails the
-1case. - With
ZERO_RESPONSE_HEADER_TIMEOUT=300sexported,internal/providers/provideriopasses here on Windows.
CI hadn't run on this head either, so I approved the runs. The one red check, Security & Code Health, is GO-2026-6617 in Go 1.26.6's net/http: the branch still pins 1.26.6 and main moved to 1.26.9 today, so merging main clears it. Approving.
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hello @FabioLeitao please check the failing CI check |
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Hi @kevincodex1 — thanks for the nudge. The failing check was The workflows on the new head are waiting for approval to run (fork PR). Could you approve them when you have a moment? And thanks @Vasanthdev2004 for the careful re-review. |
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Summary
Adds an opt-in
ZERO_RESPONSE_HEADER_TIMEOUTenvironment variable for the shared HTTP transport's response header timeout, as approved on the issue: it mirrorsZERO_STREAM_IDLE_TIMEOUTand leaves the default at 120s.5m,300s) or bare seconds (300);0,off,noneanddisabled(case-insensitive) remove the limit;sharedStallClient()), not at package init, so the transport and the resolver cannot drift;providerio.Why: a local model server that must load a large model can take longer than 120s to send the first byte (measured 1-5 minutes on a throttled local Ollama), so an otherwise-alive request is aborted. Anyone who does not set the variable sees no change.
Verified against a throttled local Ollama:
ZERO_RESPONSE_HEADER_TIMEOUT=5sfails at ~6.4s,=300ssucceeds at ~223s (a request that would have hit the old 120s ceiling).Also changes
ZERO_STREAM_IDLE_TIMEOUT(overflow only)Following review, both resolvers share one bare-seconds parser with an overflow guard. For
ZERO_STREAM_IDLE_TIMEOUTthis changes one edge case: a bare-seconds value too large fortime.Durationused to wrap and could disable the idle timeout; it now keeps the default. Every other input behaves as before.Linked issue
Fixes #1038
Checklist
issue-approvedlabel.go build ./...andgo vet ./...pass locally.go test ./...passes locally, withumask 022 TMPDIR=/tmp TZ=UTC. Without those settings my workstation (umask 0027, non-defaultTMPDIR, UTC-3) fails file-mode, sandbox-golden, socket-path and one TUI date test; the same packages fail the same way on a checkout without this change.gofmtclean.-race).Verification
On head
afba2ddd, based onmainat99721c76:make fmt-check,go vet ./...,go test -count=1 ./...,go test -race ./internal/providers/providerio,go run ./cmd/zero-release build,go run ./cmd/zero-release smoke,make vulncheck,git diff HEAD --check: pass.make lint-static: only the 4 findings already onmain(installtest,proxydialx2,web_fetch.go); none in changed files.go vet+go test -c) forwindows/amd64,darwin/amd64,darwin/arm64: pass. Tests were not run on macOS or Windows.DefaultResponseHeaderTimeoutback on the transport failsTestHTTPClientTransportUsesResolvedHeaderTimeout).gosecandsemgrep(p/golang): no new findings compared withmain.gitleakson the branch commits: clean.go.mod/go.sumuntouched).Notes
Prepared with AI assistance (Claude Code) and reviewed and measured by the human author (HITL), per the contribution guidelines.