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fix(workers): prevent uvloop from setting global event loop policy in healthcheck #19660

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Merged
zzstoatzz merged 1 commit into from
Dec 5, 2025
Merged

fix(workers): prevent uvloop from setting global event loop policy in healthcheck #19660

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11 changes: 5 additions & 6 deletions src/prefect/workers/server.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,7 @@
from fastapi import APIRouter, FastAPI, status
from fastapi.responses import JSONResponse

from prefect.settings import (
PREFECT_WORKER_WEBSERVER_HOST,
PREFECT_WORKER_WEBSERVER_PORT,
)
from prefect.settings import get_current_settings
from prefect.workers.base import BaseWorker


Expand Down Expand Up @@ -42,11 +39,13 @@ def perform_health_check():

app.include_router(router)

settings = get_current_settings()
config = uvicorn.Config(
app=app,
host=PREFECT_WORKER_WEBSERVER_HOST.value(),
port=PREFECT_WORKER_WEBSERVER_PORT.value(),
host=settings.worker.webserver.host,
port=settings.worker.webserver.port,
log_level=log_level,
loop="asyncio", # prevent uvloop from setting global policy
)
return uvicorn.Server(config=config)

Expand Down