aiohttp setuptools warnings (Fix)

The Fix

Removed non SPDX-license description from setup.cfg to comply with PEP 639.

Based on closed aio-libs/aiohttp issue #10662 · 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%.

Jump to Verify Open PR/Commit

@@ -0,0 +1 @@
@@ -0,0 +1 @@
+Removed non SPDX-license description from ``setup.cfg`` -- by :user:`devanshu-ziphq`.
diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 7c36b570e87..89eb3ae621a 100644

repro.py

$ python -m pip show aiohttp
Name: aiohttp
Version: 3.11.15
Summary: Async http client/server framework (asyncio)
Home-page: https://github.com/aio-libs/aiohttp
Author: 
Author-email: 
License: Apache-2.0
Location: /usr/lib/pypy3.10/site-packages
Requires: aiohappyeyeballs, aiosignal, async-timeout, attrs, frozenlist, multidict, propcache, yarl
Required-by: aiohttp-cors, aiohttp_socks, pytest-aiohttp

verify

Re-run the minimal reproduction on your broken version, then apply the fix and re-run.

fix.md

Option A — Apply the official fix\nRemoved non SPDX-license description from setup.cfg to comply with PEP 639.\nWhen NOT to use: This fix should not be applied if license classifiers are required for compliance.\n\n

Why This Fix Works in Production

Trigger: ```python-traceback
Mechanism: Removed non SPDX-license description from setup.cfg to comply with PEP 639.

Production impact:

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 3.10.16 in real deployments (not just unit tests).
Production symptom (often without a traceback): ```python-traceback

Proof / Evidence

GitHub issue: #10662
Fix PR: https://github.com/aio-libs/aiohttp/pull/10881
Reproduced locally: No (not executed)
Last verified: 2026-02-09
Confidence: 0.70
Did this fix it?: Yes (upstream fix exists)
Own content ratio: 0.55

Discussion

High-signal excerpts from the issue thread (symptoms, repros, edge-cases).

Jump to Sources Open on GitHub

“It's probably a PEP 639 thing. Thanks for reporting!”

@webknjaz · 2025-04-01 · source

“fixed via https://github.com/aio-libs/aiohttp/pull/10881”

@bdraco · 2025-05-23 · source

Failure Signature (Search String)

```python-traceback
Requires: aiohappyeyeballs, aiosignal, async-timeout, attrs, frozenlist, multidict, propcache, yarl

Copy-friendly signature

signature.txt

Failure Signature
-----------------
```python-traceback
Requires: aiohappyeyeballs, aiosignal, async-timeout, attrs, frozenlist, multidict, propcache, yarl

Error Message

Signature-only (no traceback captured)

error.txt

Error Message
-------------
```python-traceback
Requires: aiohappyeyeballs, aiosignal, async-timeout, attrs, frozenlist, multidict, propcache, yarl

Minimal Reproduction

repro.py

$ python -m pip show aiohttp
Name: aiohttp
Version: 3.11.15
Summary: Async http client/server framework (asyncio)
Home-page: https://github.com/aio-libs/aiohttp
Author: 
Author-email: 
License: Apache-2.0
Location: /usr/lib/pypy3.10/site-packages
Requires: aiohappyeyeballs, aiosignal, async-timeout, attrs, frozenlist, multidict, propcache, yarl
Required-by: aiohttp-cors, aiohttp_socks, pytest-aiohttp

Environment

Python: 3.10.16

What Broke

Warnings during wheel building can lead to confusion and hinder deployment.

Fix Options (Details)

Option A — Apply the official fix

Removed non SPDX-license description from setup.cfg to comply with PEP 639.

When NOT to use: This fix should not be applied if license classifiers are required for compliance.

Fix reference: https://github.com/aio-libs/aiohttp/pull/10881

Last verified: 2026-02-09. Validate in your environment.

When NOT to Use This Fix

This fix should not be applied if license classifiers are required for compliance.

Verify Fix

verify

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

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.

Related Issues

No related fixes found.

Cluster: aiohttp:configuration-error All hubs All clusters

Related clusters: Data consistency Race condition Auth

Sources

We don’t republish the full GitHub discussion text. Use the links above for context.