The Fix
Allows aiohttp's cleanup contexts to accept async context managers in addition to single-yielding async generators, ensuring backward compatibility.
Based on closed aio-libs/aiohttp issue #11681 · PR/commit linked
@@ -0,0 +1,6 @@
@@ -0,0 +1,6 @@
+Started accepting :term:`asynchronous context managers <asynchronous context manager>` for cleanup contexts.
+Legacy single-yield :term:`asynchronous generator` cleanup contexts continue to be
+supported; async context managers are adapted internally so they are
Option A — Apply the official fix\nAllows aiohttp's cleanup contexts to accept async context managers in addition to single-yielding async generators, ensuring backward compatibility.\nWhen NOT to use: This fix should not be used if existing code relies solely on single-yield async generators.\n\n
Why This Fix Works in Production
- Trigger: Completely changing cleanup contexts from async generators to async context managers would make it incompatible with existing codes, so we need to make it…
- Mechanism: aiohttp's cleanup contexts did not accept async context managers, limiting flexibility in resource management
Why This Breaks in Prod
- aiohttp's cleanup contexts did not accept async context managers, limiting flexibility in resource management
- Production symptom (often without a traceback): Completely changing cleanup contexts from async generators to async context managers would make it incompatible with existing codes, so we need to make it accept both.
Proof / Evidence
- GitHub issue: #11681
- Fix PR: https://github.com/aio-libs/aiohttp/pull/11704
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.70
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.75
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“### Is your feature request related to a problem? Typing application-level resource init & cleanup contexts with contextlib.asynccontextmanager makes them unusable as aiohttp's cleanup contexts, though the concept is same. ### Describe the”
Failure Signature (Search String)
- Completely changing cleanup contexts from async generators to async context managers would make it incompatible with existing codes, so we need to make it accept both.
Copy-friendly signature
Failure Signature
-----------------
Completely changing cleanup contexts from async generators to async context managers would make it incompatible with existing codes, so we need to make it accept both.
Error Message
Signature-only (no traceback captured)
Error Message
-------------
Completely changing cleanup contexts from async generators to async context managers would make it incompatible with existing codes, so we need to make it accept both.
What Broke
Developers faced limitations in defining cleanup contexts, impacting resource management in applications.
Why It Broke
aiohttp's cleanup contexts did not accept async context managers, limiting flexibility in resource management
Fix Options (Details)
Option A — Apply the official fix
Allows aiohttp's cleanup contexts to accept async context managers in addition to single-yielding async generators, ensuring backward compatibility.
Fix reference: https://github.com/aio-libs/aiohttp/pull/11704
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- This fix should not be used if existing code relies solely on single-yield async generators.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Capture the exact failing error string in logs and tests so you can reproduce via a minimal script.
- Pin production dependencies and upgrade only with a reproducible test that hits the failing path.
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.