From a2372c5eaa6357dc678239ccea21c4e42f3f5aae Mon Sep 17 00:00:00 2001
From: ValueOn AG <p.motsch@valueon.ch>
Date: Fri, 17 Apr 2026 21:46:25 +0200
Subject: [PATCH] fixes

---
 app.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/app.py b/app.py
index ae409883..cb9377af 100644
--- a/app.py
+++ b/app.py
@@ -360,6 +360,18 @@ async def lifespan(app: FastAPI):
         eventManager.set_event_loop(main_loop)
         from modules.workflows.scheduler.mainScheduler import setMainLoop as setSchedulerMainLoop
         setSchedulerMainLoop(main_loop)
+
+        # Suppress noisy ConnectionResetError from ProactorEventLoop on Windows
+        # when clients (browsers) close connections abruptly. This is a known
+        # asyncio issue on Windows: https://bugs.python.org/issue39010
+        def _suppressClientDisconnect(loop, ctx):
+            exc = ctx.get("exception")
+            if isinstance(exc, ConnectionResetError):
+                return
+            if isinstance(exc, ConnectionAbortedError):
+                return
+            loop.default_exception_handler(ctx)
+        main_loop.set_exception_handler(_suppressClientDisconnect)
     except RuntimeError:
         pass
     eventManager.start()