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graceful_timeout not respected on Python 3.12 #308
Description
On Python 3.12+, after the shutdown_trigger is set, Hypercorn will wait indefinitely for ongoing requests to finish. This is contrary to the documented behavior, which says it should only wait up to config.graceful_timeout seconds, as well as to the behavior on older versions of Python.
Activity
vexofp commentedon Jun 23, 2025
This is a result of the call(s) to
server.wait_closed()in the shutdown path. Starting in 3.12, this method now waits until "all active connections have finished". (Change implemented in python/cpython#79033 with additional discussion in python/cpython#104344.)The recommend fix seems to be just not calling
wait_closed().msat-cont commentedon Dec 27, 2025
Hi, is there a progress on this issue? It is a bit terrible when the shutdown does not work.
fix: restore uvicorn (hypercorn had critical bug with python 3.12)
fix: restore uvicorn (hypercorn had critical bug with python 3.12)
fix: restore uvicorn (hypercorn had critical bug with python 3.12)
ahxxm commentedon Mar 14, 2026
wait_closed()also seems to wait for all active connections, listening sockets + websocket(for example), I've reliably reproduce 'unblock' C-c shutdown by close a tab