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fix(models,transport): read the Idempotent-Replayed header and lift the run timeout above Router's deadline - #168
When a model run takes as long as the server allows, the server sends back a proper "ran out of time" answer that says which request it was and when to try again. The SDK used to give up waiting at exactly the same moment, so callers could get a bare timeout and lose that information about a generation that may already be billed. The SDK now waits one minute longer than the server's limit, it also reads the server's reply details reliably however their names are capitalised, and it keeps its automatic "collect the finished result" retry available even for a run that first had to wait for a free connection.
What changed
Update after merging main:main has since landed the same Idempotent-Replayed spelling fix independently (#166), and the credits-header work (X-Comfy-Credits-Used) has landed too. Against current main, this PR's net change is: the run-timeout lift (item 2), the named header constants plus httpx.Headers normalization in _run_result, and the source-table contract pins in tests/test_router_spec_contract.py, which now sit alongside main's field-level lift pins rather than replacing them.
1. replayed reads the header the contract declares.RouterRunResult._run_result now reads Idempotent-Replayed instead of X-Comfy-Idempotent-Replayed. The vendored contract confirms the name: spec/router-openapi.yaml defines the RouterIdempotentReplayedHeader component and references it as Idempotent-Replayed on every replayable response (the 200, and the recorded 4xx/5xx shapes). The field's own docstring carried the same wrong prefix and is corrected too. Headers arrive as httpx.Headers (case-insensitive), so the defect was purely the wrong name, not casing.
Tests: the existing unit test is re-pointed at the contract name (Idempotent-Replayed) rather than a literal copied from the implementation — a literal repeated from the code is what let the bug pass review in the first place. A new end-to-end test (test_run_detailed_reports_a_replay_end_to_end_against_the_server) drives a real replay through the fake server, which replies with the actual Idempotent-Replayed: true header, and asserts run_detailed(...).replayed is True. Reverting only the code line makes both of these fail (confirmed locally), so they genuinely guard the fix rather than restating it.
2. Client run timeout now sits above Router's deadline.MODEL_RUN_TIMEOUT is no longer a bare 600.0. A named ROUTER_DEADLINE = 600.0 constant mirrors Router's server-side DefaultDeadline, and the client read timeout is derived as ROUTER_DEADLINE + 60s of headroom — enough to receive the 504 and its headers instead of racing it. The coupling is documented at the constant ("if you raise Router's deadline, raise this too"). connect stays 10s.
The retry test test_the_collect_budget_outlasts_a_server_deadline_window previously used MODEL_RUN_TIMEOUT.read as its stand-in for "the server's deadline window" — that only worked because the two values were mistakenly equal, which is defect 2 itself. It now sources the window from ROUTER_DEADLINE and additionally asserts the new invariant MODEL_RUN_TIMEOUT.read > ROUTER_DEADLINE. The other timeout tests (>= 120s read, <= 30s connect; the literal 600.0 server-deadline advances in the fake-clock tests) remain correct because Router's deadline itself is unchanged.
Scope swept
Both defects are fully addressed in this repo. Sweep of the portion not being changed: grep across src/ found exactly three occurrences of the replayed-header spelling — the code read (fixed), the field docstring (fixed), and one prose reference at models.py:436 that was already correct — and no other reader of the header anywhere in src/. All MODEL_RUN_TIMEOUT consumers were checked; none assume the literal 600 except the one retry test corrected here.
Residual
Credits-header work has landed on main.X-Comfy-Credits-Used is now one of the five constants in _RUN_RESULT_HEADERS, and its name is pinned against spec/router-openapi.yaml by both this PR's source-table test and main's field-level lift test.
Cross-repo artifacts not exercised (no access from this environment). The originating report cites two files that live in the Router service repo, not here: router-reference.mdx (the header docs) and routerdeadline/routerdeadline.go (DefaultDeadline = 10 * time.Minute). I could not open either. I verified the header name against this repo's vendored spec/router-openapi.yaml (synced from that service) instead, and encoded the 10-minute deadline as ROUTER_DEADLINE = 600.0 with a comment pointing at the Go constant; if Router's deadline is ever raised, this default must be raised to match.
Deliberately did not read COMFY_ROUTER_DEADLINE in the client. The report floated deriving the timeout from that env var. I did not, because it configures the Router deployment's environment, not the caller's — a same-named client-side variable would be a misleading second source of truth that silently disagrees with the server it is meant to track. The client-side mitigation is the named-and-documented ROUTER_DEADLINE constant plus headroom, which is the "at minimum, comment the relationship" path.
Review round — cursor-review panel
Five threads, all resolved. Three fixes, one partial, one answered without a code change.
Fixed — _run_result reads headers case-insensitively. It is annotated Mapping[str, str] and all the names it reads are mixed-case, so it worked only because post_model_run happens to hand it an httpx.Headers. Any plain mapping — dict(resp.headers), which httpx lowercases — would have missed all of them and yielded replayed=False and request_id=None without raising, which is the same silent shape as the wrong header name this PR fixes. It now normalizes through httpx.Headers(headers) first.
Fixed — the header names are pinned to the contract. The names (now five, including X-Comfy-Credits-Used) are constants (_RUN_RESULT_HEADERS) and tests/test_router_spec_contract.py::test_the_headers_a_run_result_reads_are_the_spec_s pins each against spec/router-openapi.yaml's runRouterModel 200, parametrized per name, reached by searching for the operationId rather than looking up the path. The assertion is one-way (everything read is declared) because the 200 also carries headers RouterRunResult does not surface. Plus test_the_replayed_header_carries_no_x_comfy_prefix as a named regression case. This is the check whose absence let the prefixed name through.
Fixed — docs that asserted the old equality. Decoupling the client timeout from Router's deadline falsified prose saying the 504 arrives at "the same ten minutes as MODEL_RUN_TIMEOUT". retry.py's module docstring and collect_max_elapsed doc, models.py's run docstring, and README.md now point at ROUTER_DEADLINE — the constant that is actually ten minutes and the one collect_max_elapsed's "two windows" derivation depends on.
Partial — the positional httpx.Timeout argument. Correct that one positional value set write and pool as well as read. write is fixed: pushing a request body has no business inheriting an eleven-minute generation wait, so it is now 120s (still generous for a multi-megabyte inline base64 image, which httpx hands to the transport as a single write). pool is deliberately kept generation-scale, because on this route the pool is full of generations: a run is awaited server-side, so all 100 of httpx's default connections are held for up to ROUTER_DEADLINE, and the 101st caller is queued behind a generation rather than a handshake. A short pool bound would convert a legitimate fan-out from a queue that drains into a wall of PoolTimeout — 150 concurrent 2-minute runs succeed today and would fail inside ~70s under a 10s bound plus the 60s max_elapsed. The accepted cost is written on the constant: in the pathological case where the pool never frees, the caller waits eleven minutes and PoolTimeout surfaces without a retry, its fast-class budget long spent. All four bounds are now named explicitly so none is inherited again, and test_every_bound_of_the_run_timeout_is_chosen_rather_than_inherited asserts the trade.
Answered, no code change — a client-side COMFY_ROUTER_DEADLINE. Already covered under Residual below; it configures Router's environment, not the caller's, and a same-named client variable would be a second source of truth that can silently disagree with the server it tracks. Additionally, this repo's env idiom is per-construction (_resolve_router_base_url() at client.py:250/:414), not import-time, so doing it properly means threading a resolved value through every timeout=MODEL_RUN_TIMEOUT default — a design change, not an override. The supported lever for a longer-deadline deployment is the public run(..., timeout=...).
Deferred to a tracked follow-up.Comfy/AsyncComfy expose no limits=, so a caller cannot raise max_connections — the real lever for a fan-out that should not queue at all. New public API on both client surfaces, out of scope for a defect fix; proposed as a follow-up rather than dropped.
Review round — collect budget after a pool wait
Fixed — the collect budget now reserves the pool wait. The collect budget's clock starts before a run waits for a pooled connection, but Router's deadline only starts once the request is sent. A run queued for most of the 660s pool bound and then held to the full 600s deadline received its 504 deadline_exceeded after the 1200s budget had closed, so it was raised instead of collected. The default RetryPolicy.collect_max_elapsed is now derived as the pool bound plus two ROUTER_DEADLINE windows (1860s); an explicitly set value keeps its meaning. test_a_deadline_504_after_a_long_pool_wait_still_gets_a_collect_attempt pins the sequence on a fake clock and fails against the old default. README, CHANGELOG and docstrings now say thirty-one minutes.
Provenance
Authored by: agent-work loop
Verified:
Full suite at the current head: 1286 passed, 9 skipped.
ruff check ., ruff format --check ., mypy src and scripts/check_public_repo_hygiene.py: clean.
The new pool-wait collect test fails with the default put back to 1200s and passes with the derived 1860s.
Earlier rounds checked each guard by reverting its fix: dropping the httpx.Headers normalization, re-adding the X-Comfy- prefix, or putting read back at 600 each makes its test fail.
Deviations:
MODEL_RUN_TIMEOUT.pool stays generation-scale rather than shortened, so fan-out past 100 concurrent runs still works; the longer default collect budget covers that wait instead.
COMFY_ROUTER_DEADLINE is not read client-side (see Residual), and the limits= passthrough on the clients was deferred to a follow-up.
Merge-conflict resolution kept both main's lift pins and this PR's source-table checks, and kept both CHANGELOG entries.
Summary by CodeRabbit
Bug Fixes
Model runs now allow Router’s ten-minute deadline to expire before the client read timeout, so Router timeout responses can surface.
Response metadata is parsed consistently regardless of HTTP header capitalization.
Replay information is preserved across failed runs and retries without starting duplicate generations.
Replay metadata uses the unprefixed Idempotent-Replayed response header.
Documentation
Clarified model-run and retry timeout behavior: read and pool timeouts include one minute beyond Router’s deadline, write timeout is 120 seconds, and connect timeout is 10 seconds.
…declares
RouterRunResult.replayed read X-Comfy-Idempotent-Replayed, but Router
sends Idempotent-Replayed (no X-Comfy- prefix), as spec/router-openapi.yaml
declares on every replayable response. The names could never match, so
replayed was False on every response including a genuine replay — the exact
signal a caller uses to avoid double-charging, wrong 100% of the time and
silently, since False is also correct for the common case.
Fix the header name (and the field docstring, which carried the same wrong
prefix). Add an end-to-end test through the fake server, which sends the real
Idempotent-Replayed header, and re-point the unit test at the contract name
rather than a literal copied from the implementation.
MODEL_RUN_TIMEOUT was 600s, exactly Router's DefaultDeadline (600s). At
equality the client can abort at the same instant Router is writing its
504 deadline_exceeded, so the caller gets a bare client-side timeout with
no X-Comfy-Request-Id, no Retry-After and no error body — the generation
billed and still running, the id needed to reason about it gone.
Derive the timeout from a named ROUTER_DEADLINE constant plus a minute of
headroom, and document the coupling at the constant so the next person
changing either number sees it.
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Files selected for processing: 5
CHANGELOG.md
README.md
src/comfy_low/transport.py
src/comfy_sdk/retry.py
tests/test_models_run_retry.py
Walkthrough
Model runs now use a read timeout one minute longer than Router’s 600-second deadline, with separate connect, write, and pool bounds. The SDK also normalizes response headers before parsing model-run metadata and checks the header contract against the Router specification.
Changes: Router deadline and timeout bounds
Layer / File(s)
Summary
Router deadline and timeout bounds src/comfy_low/transport.py, src/comfy_sdk/retry.py, README.md, tests/test_models_run_retry.py, CHANGELOG.md
Model runs use 660-second read and pool timeouts, a 10-second connect timeout, and a 120-second write timeout. Documentation and tests distinguish Router’s deadline from the client timeout.
Response-header parsing and contract validation
Layer / File(s)
Summary
Response-header parsing and contract validation src/comfy_sdk/models.py, tests/test_models_run.py, tests/test_router_spec_contract.py
The result parser defines and normalizes five Router response headers. Tests cover case-insensitive parsing, replay behavior, and header names and fields against the Router specification.
Callers who fan out more runs than the connection pool holds can wait a long time for a connection and then receive a deadline error without automatic collection of the generation. The PR otherwise fixes the replay-header name and the timeout headroom. Resolve or explicitly accept the pool-wait and collect-budget interaction before merging.
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…ed names, sane write bound
Addresses the cursor-review panel on #168.
- `_run_result` normalizes through `httpx.Headers` before every lookup. It is
annotated `Mapping[str, str]` and all four names it reads are mixed-case, so
a plain mapping (`dict(resp.headers)`, which httpx lowercases) missed all of
them silently -- `replayed=False`, `request_id=None`, no error. That is the
same shape of silent miss the wrong header name in this PR produced.
- The four header names are named constants pinned against
`spec/router-openapi.yaml` by a new parametrized test in
test_router_spec_contract.py, one-way (everything read is declared; the 200
also carries headers the SDK does not surface). A wrong name cannot fail at
runtime, so only a comparison against the contract catches it -- this is the
check that was missing when `Idempotent-Replayed` was read prefixed.
- `MODEL_RUN_TIMEOUT` names all four bounds explicitly. A single positional
argument set `write` and `pool` to the generation wait as well; `write` bounds
pushing the request body up and has no business getting eleven minutes, so it
is now 120s -- still generous for a multi-megabyte inline base64 image. `pool`
stays generation-scale deliberately (every pooled connection is held for a
whole generation and `Comfy` exposes no `limits=`, so shortening it would turn
a legitimate fan-out past httpx's 100 connections into a wall of PoolTimeout);
it is now stated and asserted as a decision rather than inherited.
- Docs that asserted the old `MODEL_RUN_TIMEOUT == Router's deadline` equality
now point at `ROUTER_DEADLINE`, which is the constant that is actually ten
minutes and the one `collect_max_elapsed`'s "two windows" derivation depends
on: retry.py's module docstring and `collect_max_elapsed`, models.py's `run`
docstring, and README.md.
Both new guards were falsified by reverting their fix and confirming they fail.
Co-Authored-By: Claude Opus 5 <[email protected]>
🤖 The reviews loop filed Linear follow-up ticket(s) for review thread(s) deferred as out of scope for this PR:
BE-15947 — Expose httpx connection-pool limits on Comfy/AsyncComfy so a model-run fan-out can raise max_connections — filed as agent-spike (premise unverified)
The following carry agent-spike instead of agent-ok because their reachability claim was not backed by evidence (BE-5378) — the claim is investigated before any code is written, and "the premise does not hold" is a valid, successful outcome:
Expose httpx connection-pool limits on Comfy/AsyncComfy so a model-run fan-out can raise max_connections — no reachability block in the proposal
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…sed header
main added `X-Comfy-Credits-Used` (#166) via plain, case-sensitive header
lookups while this branch moved `_run_result` onto case-insensitive,
constant-named lookups (`_HEADER_*`) precisely to stop that class of bug.
Folds credits_used onto the same `_HEADER_CREDITS_USED` constant and
`sent.get(...)` path, and reconciles the two independently-written
test_router_spec_contract.py suites into one: the spec sync that landed
after #166 (86d8f2c) already declares the header, so its lift moves from
the "undeclared, tripwire" set into the pinned `_RUN_RESULT_HEADERS`, and
the tripwire test that would otherwise now fail is retired in favor of the
sensitivity check it was gated behind.
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Actionable comments posted: 1
🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@src/comfy_low/transport.py`:
- Around line 130-132: Update the timeout documentation near the transport
timeout configuration to state that read and pool use generation-scale timeouts
while write is shorter. Also update tests/test_models_run_retry.py lines 967-967
to replace “Two of those three” with wording identifying only write; no other
behavior changes are needed.
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README.md
src/comfy_low/transport.py
src/comfy_sdk/models.py
src/comfy_sdk/retry.py
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tests/test_router_spec_contract.py
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Two docstrings disagreed about which of the three positional-argument
bounds (read/write/pool) is generation-scale: the MODEL_RUN_TIMEOUT
comment and the retry test's docstring both said only read was, while
pool is deliberately set equal to read a few lines above (and asserted
so). Only write is actually short here.
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The branch conflicted with main in models.py and tests/test_router_spec_contract.py. Main (feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166) already reads Idempotent-Replayed, so the merge keeps this PR's header constants and the httpx.Headers normalization on main's dict | BinaryResult signature, keeps main's binary and discovery contract tests, and drops main's _CONTRACT_HEADER_LIFTS tests, which _RUN_RESULT_HEADERS now covers (credits included).
CHANGELOG had no entry for the new default timeouts (read 660s, write 120s, pool 660s) or the new ROUTER_DEADLINE constant; added one under Unreleased / Fixed. Re-wrapped the README paragraph the PR edited.
Clean:
The deadline claim: Router's DefaultDeadline is 10 * time.Minute in routerdeadline/routerdeadline.go, the config default is COMFY_ROUTER_DEADLINE=10m, and no deploy overlay overrides it, so 600s plus 60s of headroom sits above every deployed deadline. Nothing in front of Router cuts the connection sooner (that file notes the load balancer runs timeoutSec: 86400).
CodeRabbit's change request (pool vs write prose) was fixed in ef02cd3 and is still right after the merge.
Parity with the TypeScript SDK: it reads Idempotent-Replayed by presence, the same as here, and its whole-call default is 20 minutes, so it does not race Router's 504 either.
The new tests guard the fixes: with the httpx.Headers normalization removed, the lowercased-mapping test fails; with read set back to 600, test_the_collect_budget_outlasts_a_server_deadline_window fails.
Checked:
Full suite on the merged head: 1241 passed, 9 skipped; ruff, ruff format, mypy, the drift and hygiene scripts all clean.
…d-header-and-run-timeout
Conflict in tests/test_router_spec_contract.py: main (#182) grew the
run_detailed lift-pinning block (_HEADER_PROBES, _CONTRACT_HEADER_LIFTS,
completeness and exemption tests); this branch pins its source-side
_RUN_RESULT_HEADERS table. Keep main's block whole and keep this branch's
spec-declared and no-X-Comfy-prefix checks, replacing its duplicate-named
lift test with one asserting _RUN_RESULT_HEADERS is exactly the pinned
lift set.
CHANGELOG: main cut 0.5.0, and the auto-merge placed this branch's
timeout entry inside it; move it back under Unreleased.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
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🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/comfy_low/transport.py:
- Line 130: Update _MODEL_RUN_POOL_TIMEOUT and the Retrier timing so pool
acquisition time is budgeted outside the 1,200-second collection window,
allowing collection after a 610-second pool wait and a 600-second Router
request. Add a fake-clock test covering this sequence and verifying automatic
collection is attempted.
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CHANGELOG.md
src/comfy_low/transport.py
src/comfy_sdk/models.py
src/comfy_sdk/retry.py
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tests/test_router_spec_contract.py
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The collect budget is measured from before a run waits for a pooled
connection, but Router's deadline only starts once the request is sent.
A run queued for most of the 660-second pool bound and then held to the
full 600-second deadline received its 504 deadline_exceeded after the
1200-second budget had closed, and raised it instead of collecting.
Derive the default collect_max_elapsed as the pool bound plus two
deadline windows (1860s), and pin that sequence with a fake-clock test.
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ELI5
When a model run takes as long as the server allows, the server sends back a proper "ran out of time" answer that says which request it was and when to try again. The SDK used to give up waiting at exactly the same moment, so callers could get a bare timeout and lose that information about a generation that may already be billed. The SDK now waits one minute longer than the server's limit, it also reads the server's reply details reliably however their names are capitalised, and it keeps its automatic "collect the finished result" retry available even for a run that first had to wait for a free connection.
What changed
1.
replayedreads the header the contract declares.RouterRunResult._run_resultnow readsIdempotent-Replayedinstead ofX-Comfy-Idempotent-Replayed. The vendored contract confirms the name:spec/router-openapi.yamldefines theRouterIdempotentReplayedHeadercomponent and references it asIdempotent-Replayedon every replayable response (the200, and the recorded4xx/5xxshapes). The field's own docstring carried the same wrong prefix and is corrected too. Headers arrive ashttpx.Headers(case-insensitive), so the defect was purely the wrong name, not casing.Idempotent-Replayed) rather than a literal copied from the implementation — a literal repeated from the code is what let the bug pass review in the first place. A new end-to-end test (test_run_detailed_reports_a_replay_end_to_end_against_the_server) drives a real replay through the fake server, which replies with the actualIdempotent-Replayed: trueheader, and assertsrun_detailed(...).replayed is True. Reverting only the code line makes both of these fail (confirmed locally), so they genuinely guard the fix rather than restating it.2. Client run timeout now sits above Router's deadline.
MODEL_RUN_TIMEOUTis no longer a bare600.0. A namedROUTER_DEADLINE = 600.0constant mirrors Router's server-sideDefaultDeadline, and the client read timeout is derived asROUTER_DEADLINE + 60sof headroom — enough to receive the504and its headers instead of racing it. The coupling is documented at the constant ("if you raise Router's deadline, raise this too").connectstays 10s.test_the_collect_budget_outlasts_a_server_deadline_windowpreviously usedMODEL_RUN_TIMEOUT.readas its stand-in for "the server's deadline window" — that only worked because the two values were mistakenly equal, which is defect 2 itself. It now sources the window fromROUTER_DEADLINEand additionally asserts the new invariantMODEL_RUN_TIMEOUT.read > ROUTER_DEADLINE. The other timeout tests (>= 120sread,<= 30sconnect; the literal600.0server-deadline advances in the fake-clock tests) remain correct because Router's deadline itself is unchanged.Scope swept
Both defects are fully addressed in this repo. Sweep of the portion not being changed:
grepacrosssrc/found exactly three occurrences of the replayed-header spelling — the code read (fixed), the field docstring (fixed), and one prose reference atmodels.py:436that was already correct — and no other reader of the header anywhere insrc/. AllMODEL_RUN_TIMEOUTconsumers were checked; none assume the literal600except the one retry test corrected here.Residual
main.X-Comfy-Credits-Usedis now one of the five constants in_RUN_RESULT_HEADERS, and its name is pinned againstspec/router-openapi.yamlby both this PR's source-table test andmain's field-level lift test.router-reference.mdx(the header docs) androuterdeadline/routerdeadline.go(DefaultDeadline = 10 * time.Minute). I could not open either. I verified the header name against this repo's vendoredspec/router-openapi.yaml(synced from that service) instead, and encoded the 10-minute deadline asROUTER_DEADLINE = 600.0with a comment pointing at the Go constant; if Router's deadline is ever raised, this default must be raised to match.COMFY_ROUTER_DEADLINEin the client. The report floated deriving the timeout from that env var. I did not, because it configures the Router deployment's environment, not the caller's — a same-named client-side variable would be a misleading second source of truth that silently disagrees with the server it is meant to track. The client-side mitigation is the named-and-documentedROUTER_DEADLINEconstant plus headroom, which is the "at minimum, comment the relationship" path.Review round — cursor-review panel
Five threads, all resolved. Three fixes, one partial, one answered without a code change.
Fixed —
_run_resultreads headers case-insensitively. It is annotatedMapping[str, str]and all the names it reads are mixed-case, so it worked only becausepost_model_runhappens to hand it anhttpx.Headers. Any plain mapping —dict(resp.headers), which httpx lowercases — would have missed all of them and yieldedreplayed=Falseandrequest_id=Nonewithout raising, which is the same silent shape as the wrong header name this PR fixes. It now normalizes throughhttpx.Headers(headers)first.Fixed — the header names are pinned to the contract. The names (now five, including
X-Comfy-Credits-Used) are constants (_RUN_RESULT_HEADERS) andtests/test_router_spec_contract.py::test_the_headers_a_run_result_reads_are_the_spec_spins each againstspec/router-openapi.yaml'srunRouterModel200, parametrized per name, reached by searching for theoperationIdrather than looking up the path. The assertion is one-way (everything read is declared) because the 200 also carries headersRouterRunResultdoes not surface. Plustest_the_replayed_header_carries_no_x_comfy_prefixas a named regression case. This is the check whose absence let the prefixed name through.Fixed — docs that asserted the old equality. Decoupling the client timeout from Router's deadline falsified prose saying the
504arrives at "the same ten minutes asMODEL_RUN_TIMEOUT".retry.py's module docstring andcollect_max_elapseddoc,models.py'srundocstring, andREADME.mdnow point atROUTER_DEADLINE— the constant that is actually ten minutes and the onecollect_max_elapsed's "two windows" derivation depends on.Partial — the positional
httpx.Timeoutargument. Correct that one positional value setwriteandpoolas well asread.writeis fixed: pushing a request body has no business inheriting an eleven-minute generation wait, so it is now 120s (still generous for a multi-megabyte inline base64 image, which httpx hands to the transport as a single write).poolis deliberately kept generation-scale, because on this route the pool is full of generations: a run is awaited server-side, so all 100 of httpx's default connections are held for up toROUTER_DEADLINE, and the 101st caller is queued behind a generation rather than a handshake. A short pool bound would convert a legitimate fan-out from a queue that drains into a wall ofPoolTimeout— 150 concurrent 2-minute runs succeed today and would fail inside ~70s under a 10s bound plus the 60smax_elapsed. The accepted cost is written on the constant: in the pathological case where the pool never frees, the caller waits eleven minutes andPoolTimeoutsurfaces without a retry, its fast-class budget long spent. All four bounds are now named explicitly so none is inherited again, andtest_every_bound_of_the_run_timeout_is_chosen_rather_than_inheritedasserts the trade.Answered, no code change — a client-side
COMFY_ROUTER_DEADLINE. Already covered under Residual below; it configures Router's environment, not the caller's, and a same-named client variable would be a second source of truth that can silently disagree with the server it tracks. Additionally, this repo's env idiom is per-construction (_resolve_router_base_url()atclient.py:250/:414), not import-time, so doing it properly means threading a resolved value through everytimeout=MODEL_RUN_TIMEOUTdefault — a design change, not an override. The supported lever for a longer-deadline deployment is the publicrun(..., timeout=...).Deferred to a tracked follow-up.
Comfy/AsyncComfyexpose nolimits=, so a caller cannot raisemax_connections— the real lever for a fan-out that should not queue at all. New public API on both client surfaces, out of scope for a defect fix; proposed as a follow-up rather than dropped.Review round — collect budget after a pool wait
Fixed — the collect budget now reserves the pool wait. The collect budget's clock starts before a run waits for a pooled connection, but Router's deadline only starts once the request is sent. A run queued for most of the 660s pool bound and then held to the full 600s deadline received its
504 deadline_exceededafter the 1200s budget had closed, so it was raised instead of collected. The defaultRetryPolicy.collect_max_elapsedis now derived as the pool bound plus twoROUTER_DEADLINEwindows (1860s); an explicitly set value keeps its meaning.test_a_deadline_504_after_a_long_pool_wait_still_gets_a_collect_attemptpins the sequence on a fake clock and fails against the old default. README, CHANGELOG and docstrings now say thirty-one minutes.Provenance
ruff check .,ruff format --check .,mypy srcandscripts/check_public_repo_hygiene.py: clean.httpx.Headersnormalization, re-adding theX-Comfy-prefix, or puttingreadback at 600 each makes its test fail.MODEL_RUN_TIMEOUT.poolstays generation-scale rather than shortened, so fan-out past 100 concurrent runs still works; the longer default collect budget covers that wait instead.COMFY_ROUTER_DEADLINEis not read client-side (see Residual), and thelimits=passthrough on the clients was deferred to a follow-up.main's lift pins and this PR's source-table checks, and kept both CHANGELOG entries.Summary by CodeRabbit
Bug Fixes
Idempotent-Replayedresponse header.Documentation