Retry transient 401 from api.comfy.org in API node client

[chelsealong]

Fixes #15856

Problem

api.comfy.org intermittently returns HTTP 401 {"message": "Invalid Comfy API key"} for a valid, unchanged API key. The requests immediately before and after the failing one succeed with the same key, and a follow-up request with the same key also succeeds — so the 401 is transient, not a real auth failure. Today comfy_api_nodes/util/client.py treats every 401 as fatal and raises Unauthorized: Please login first to use this node., which aborts the entire workflow.

The issue reporter confirmed that locally adding 401 to _RETRY_STATUS let the existing retry mechanism recover from the transient 401 without interrupting the workflow.

Fix

Add 401 to _RETRY_STATUS in comfy_api_nodes/util/client.py so a 401 is retried the same way as the other transient statuses already in that set (408, 500, 502, 503, 504), using the existing bounded retry/backoff logic (max_retries, default 3). A persistent/genuine 401 still raises the same Unauthorized error once retries are exhausted.

-_RETRY_STATUS = {408, 500, 502, 503, 504}  # status 429 is handled separately
+_RETRY_STATUS = {401, 408, 500, 502, 503, 504}  # status 429 is handled separately

Testing

Added tests-unit/comfy_api_nodes_test/client_retry_test.py with two cases, mocking aiohttp.ClientSession to return canned responses:

• test_transient_401_is_retried: a 401 followed by a 200 completes successfully (proves the retry happens).
• test_persistent_401_still_fails: a 401 on every attempt still raises Unauthorized: ... once retries are exhausted (proves we didn't turn 401 into an infinite/silent retry).

Verified the first test fails without the fix:

$ git checkout HEAD~1 -- comfy_api_nodes/util/client.py
$ python -m pytest tests-unit/comfy_api_nodes_test/client_retry_test.py -v
...
tests-unit/comfy_api_nodes_test/client_retry_test.py::test_transient_401_is_retried FAILED
tests-unit/comfy_api_nodes_test/client_retry_test.py::test_persistent_401_still_fails PASSED
E   Exception: Unauthorized: Please login first to use this node.
1 failed, 1 passed
$ git checkout HEAD -- comfy_api_nodes/util/client.py

With the fix applied:

$ python -m pytest tests-unit/comfy_api_nodes_test/client_retry_test.py -v
tests-unit/comfy_api_nodes_test/client_retry_test.py::test_transient_401_is_retried PASSED
tests-unit/comfy_api_nodes_test/client_retry_test.py::test_persistent_401_still_fails PASSED
2 passed

Full unit suite and ruff also pass:

$ python -m pytest tests-unit/
1406 passed, 10 skipped
$ ruff check .
All checks passed!

AI-assistance disclosure

This change was prepared with the assistance of an AI coding agent (Claude), based on the issue's own root-cause analysis and reporter-verified hotfix. All changes were reviewed, tested, and verified by re-running the test suite before/after the fix.

API Node PR Checklist

Scope

• Is API Node Change

Pricing & Billing

• Need pricing update
• No pricing update

If Need pricing update:

• Metronome rate cards updated
• Auto‑billing tests updated and passing

QA

• QA done
• QA not required

Comms

• Informed Kosinkadink

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**/*

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**/*: Keep changes small, direct, and limited to the narrowest necessary code path and smallest number of files.
Prefer practical fixes, minimal dependencies, and existing repository patterns; remove obsolete, dead, unreachable, or unused code.
Preserve existing APIs, node names, model-loading behavior, file layout, and workflow compatibility unless replacement is explicitly intended.
Core ComfyUI must not add outbound internet requests, telemetry, tracking, reporting, remote configuration, or background network activity. User-authorized model downloads are limited to the requested artifact and must exclude telemetry and unrelated metadata.

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Preserve shared method signatures, argument order, return shapes, side effects, and error behavior unless every affected caller and interface is intentionally updated.
Do not add unused compatibility parameters, flags, attributes, constructor options, or model-specific options to shared helpers; keep one-off behavior at the integration boundary.
Normalize third-party return conventions at integration boundaries so core code receives the expected type and shape; avoid undocumented caller-side unwrapping.
Do not add torch.no_grad, torch.inference_mode, or inference-mode wrappers. Do not add model freeze/unfreeze toggles; only disable globally enabled inference mode when a training path requires gradients.
Remove inference-only training behavior such as dropout while preserving checkpoint and state-dict compatibility; use nn.Identity when deleting a module would alter keys or ordering.
Keep imports at module scope except established optional-backend probes or imports required to avoid cycles; avoid unnecessary try/except blocks and use specific exceptions with useful fallbacks.
Do not add workarounds for unsupported library versions, especially PyTorch exception-and-float-cast retries, unless a comment names the exact versions still requiring them.
Let unsupported model formats, invalid quantization metadata, and bad states fail with clear errors instead of silently degrading output.
Match local style, keep comments sparse and useful, and remove comments that merely restate obvious code.
Treat dtype, device placement, VRAM use, and offloading as correctness concerns across CPU, CUDA, ROCm, MPS, DirectML, XPU, NPU, and low-VRAM environments.
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🔇 Additional comments (3)

tests-unit/comfy_api_nodes_test/client_retry_test.py (3)

36-59: LGTM!

---

62-81: LGTM!

---

88-88: LGTM!

Also applies to: 100-101

---

📝 Walkthrough

Walkthrough

The client now treats HTTP 401 as a retryable status alongside existing transient statuses. The existing retry budget and backoff logic applies, while HTTP 429 keeps its separate rate-limit path. Async unit tests simulate session recreation and verify recovery after a transient 401 and an unauthorized error after repeated 401 responses.

Merge Risk: ⚪ Minimal · up to 22974

The client now retries transient 401 responses while preserving the existing failure behavior for persistent invalid credentials. The change is localized and tested, with no actionable merge-blocking risk remaining after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary change: retrying transient 401 responses from api.comfy.org.
Description check	✅ Passed	The description directly explains the intermittent 401 problem, the retry fix, preserved failure behavior, and test coverage.
Linked Issues check	✅ Passed	The changes satisfy issue #15856 by retrying transient 401 responses while preserving bounded retries and persistent unauthorized errors.
Out of Scope Changes check	✅ Passed	The code and tests are limited to the linked issue's 401 retry behavior and do not introduce unrelated changes.
Docstring Coverage	✅ Passed	Docstring check was indeterminate for this PR — some files could not be analyzed in time. Not blocking.

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Inline comments:
In `@tests-unit/comfy_api_nodes_test/client_retry_test.py`:
- Around line 81-93: Update the retry-exhaustion test around sync_op_raw to
track requests made through the patched session and assert exactly three total
attempts when max_retries is 2, while retaining the Unauthorized exception
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**/*

📄 CodeRabbit inference engine (AGENTS.md)

**/*: Keep changes small, direct, and limited to the narrowest necessary code path and smallest number of files.
Prefer practical fixes, minimal dependencies, and existing repository patterns; remove obsolete, dead, unreachable, or unused code.
Preserve existing APIs, node names, model-loading behavior, file layout, and workflow compatibility unless replacement is explicitly intended.
Core ComfyUI must not add outbound internet requests, telemetry, tracking, reporting, remote configuration, or background network activity. User-authorized model downloads are limited to the requested artifact and must exclude telemetry and unrelated metadata.

Files:

• comfy_api_nodes/util/client.py
• tests-unit/comfy_api_nodes_test/client_retry_test.py

**/*.py

📄 CodeRabbit inference engine (AGENTS.md)

**/*.py: Keep state and capability flags on the object that owns the behavior. Prefer explicit parent-owned attributes over probing child objects with getattr; use child checks only when the child owns the delegated behavior.
Preserve shared method signatures, argument order, return shapes, side effects, and error behavior unless every affected caller and interface is intentionally updated.
Do not add unused compatibility parameters, flags, attributes, constructor options, or model-specific options to shared helpers; keep one-off behavior at the integration boundary.
Normalize third-party return conventions at integration boundaries so core code receives the expected type and shape; avoid undocumented caller-side unwrapping.
Do not add torch.no_grad, torch.inference_mode, or inference-mode wrappers. Do not add model freeze/unfreeze toggles; only disable globally enabled inference mode when a training path requires gradients.
Remove inference-only training behavior such as dropout while preserving checkpoint and state-dict compatibility; use nn.Identity when deleting a module would alter keys or ordering.
Keep imports at module scope except established optional-backend probes or imports required to avoid cycles; avoid unnecessary try/except blocks and use specific exceptions with useful fallbacks.
Do not add workarounds for unsupported library versions, especially PyTorch exception-and-float-cast retries, unless a comment names the exact versions still requiring them.
Let unsupported model formats, invalid quantization metadata, and bad states fail with clear errors instead of silently degrading output.
Match local style, keep comments sparse and useful, and remove comments that merely restate obvious code.
Treat dtype, device placement, VRAM use, and offloading as correctness concerns across CPU, CUDA, ROCm, MPS, DirectML, XPU, NPU, and low-VRAM environments.
Prefer existing ComfyUI and Comfy Kitchen operations, quantization helpers, cast/offload helpe...

Files:

• comfy_api_nodes/util/client.py
• tests-unit/comfy_api_nodes_test/client_retry_test.py

**/*.{py,json}

📄 CodeRabbit inference engine (AGENTS.md)

Treat legacy combo, io.Combo, and io.DynamicCombo values affecting filesystem access as untrusted; revalidate them at load/save boundaries with folder_paths, containment checks, or fixed allowlists.

Files:

• comfy_api_nodes/util/client.py
• tests-unit/comfy_api_nodes_test/client_retry_test.py

**/*.{py,md,txt,json}

📄 CodeRabbit inference engine (AGENTS.md)

Keep warning and info messages short and actionable, remove noisy or misleading logging, and make documentation edits concise, factual, and tied to changed behavior.

Files:

• comfy_api_nodes/util/client.py
• tests-unit/comfy_api_nodes_test/client_retry_test.py

**

⚙️ CodeRabbit configuration file

**: IMPORTANT: Only comment on issues directly introduced by this PR's code changes.
Treat AGENTS.md as mandatory repository policy, not optional style guidance.
Flag PR changes that violate AGENTS.md even when the code is otherwise functional.
In particular, enforce architecture boundaries, dtype/device/memory rules,
interface contracts, import style, no unnecessary try/except blocks, no inline
imports, no outbound internet paths in core ComfyUI, and narrow scoped fixes.
Prefer direct findings over suggestions when a rule is violated. Only ignore
AGENTS.md when it clearly conflicts with a newer explicit maintainer instruction
in the PR.
Do NOT flag pre-existing issues in code that was merely moved, re-indented,
de-indented, or reformatted without logic changes. If code appears in the diff
only due to whitespace or structural reformatting (e.g., removing a with: block),
treat it as unchanged. Contributors should not feel obligated to address
pre-existing issues outside the scope of their contribution.

Files:

• comfy_api_nodes/util/client.py
• tests-unit/comfy_api_nodes_test/client_retry_test.py

comfy_api_nodes/**

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🔇 Additional comments (2)

comfy_api_nodes/util/client.py (1)

87-87: LGTM!

tests-unit/comfy_api_nodes_test/client_retry_test.py (1)

1-75: LGTM!

[chelsealong]

Addressed the retry-exhaustion review comment: test_persistent_401_still_fails now counts requests through the patched session and asserts exactly 3 attempts for max_retries=2 (initial + 2 retries), instead of only checking the final exception. Verified this catches an off-by-one in the retry-exhaustion condition (temporarily loosened it locally, saw the new assertion fail with assert 4 == 3, then reverted). Full tests-unit/comfy_api_nodes_test/ suite and ruff check still pass.