The Fix
Upgrade to version 0.30.0 or later.
Based on closed Kludex/uvicorn issue #611 · PR/commit linked
Production note: Most teams hit this during upgrades or environment changes. Roll out with a canary and smoke critical endpoints (health, OpenAPI/docs) before 100%.
@@ -182,6 +182,15 @@ Uvicorn provides a lightweight way to run multiple worker processes, for example
### Gunicorn
+!!! warning
+ The `uvicorn.workers` module is deprecated and will be removed in a future release.
+
class ShortLifeWorker(UvicornWorker):
# --max-requests = 1
# --timeout = 15
# --workers=10
def notify(self):
pass
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
Option A — Upgrade to fixed release\nUpgrade to version 0.30.0 or later.\nWhen NOT to use: Do not use if it changes public behavior or if the failure cannot be reproduced.\n\n
Why This Fix Works in Production
- Trigger: Gunicorn with UvicornWorker is not respecting the timeout
- Mechanism: Deprecates the `uvicorn.workers` module in favor of a new package, addressing the issue of timeout not being respected.
- Why the fix works: Deprecates the `uvicorn.workers` module in favor of a new package, addressing the issue of timeout not being respected. (first fixed release: 0.30.0).
- If left unfixed, the same config can fail only in production (env differences), causing startup failures or partial feature outages.
Why This Breaks in Prod
- Shows up under Python 3.7 in real deployments (not just unit tests).
- Production symptom (often without a traceback): Gunicorn with UvicornWorker is not respecting the timeout
Proof / Evidence
- GitHub issue: #611
- Fix PR: https://github.com/kludex/uvicorn/pull/2302
- First fixed release: 0.30.0
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.95
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.71
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“https://github.com/benoitc/gunicorn/issues/1493 is an interesting read”
“for option 2 , untested and on top of my head, I think you can 1”
“there's probably an error in the way the gunicorn config for the timeout is passed down to the UvicornWorker ie "timeout_notify": self.timeout should certainly be…”
“@euri10 I am stuck testing to get a timeout , can you please give me your test example, or point me if I have something…”
Failure Signature (Search String)
- Gunicorn with UvicornWorker is not respecting the timeout
- I am setting up a timeout check so I made and endpoint:
Copy-friendly signature
Failure Signature
-----------------
Gunicorn with UvicornWorker is not respecting the timeout
I am setting up a timeout check so I made and endpoint:
Error Message
Signature-only (no traceback captured)
Error Message
-------------
Gunicorn with UvicornWorker is not respecting the timeout
I am setting up a timeout check so I made and endpoint:
Minimal Reproduction
class ShortLifeWorker(UvicornWorker):
# --max-requests = 1
# --timeout = 15
# --workers=10
def notify(self):
pass
Environment
- Python: 3.7
What Broke
Timeouts are not enforced, leading to long-running requests without termination.
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
Upgrade to version 0.30.0 or later.
Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.
Fix reference: https://github.com/kludex/uvicorn/pull/2302
First fixed release: 0.30.0
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- Do not use if it changes public behavior or if the failure cannot be reproduced.
Verify Fix
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Add a TLS smoke test that performs a real handshake in CI (include CA bundle validation and hostname checks).
- Alert on handshake failures by error string and endpoint to catch cert/CA changes quickly.
- Make timeouts explicit and test them (unit + integration) to avoid silent behavior changes.
- Instrument retries (attempt count + reason) and alert on spikes to catch dependency slowdowns.
Version Compatibility Table
| Version | Status |
|---|---|
| 0.30.0 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.