diff --git a/example.py b/example.py
index b244b60..8ca4d7a 100644
--- a/example.py
+++ b/example.py
@@ -92,5 +92,9 @@ async def serve(req):
     #~ logging.basicConfig(format='[%(levelname)-5s] %(name)s: %(message)s',level=logging.DEBUG)
     #~ logging.getLogger("redys.servone").setLevel( logging.INFO )
 
+    # or with gunicorn :
+    #> gunicorn -w 4 -k uvicorn.workers.UvicornWorker -b localhost:8000 example:app
+    # or with uvicorn :
+    #> uvicorn example:app --workers 4
 
     app.run(openBrowser=True)
diff --git a/htagweb/appserver.py b/htagweb/appserver.py
index 64e8ea7..cc7e048 100644
--- a/htagweb/appserver.py
+++ b/htagweb/appserver.py
@@ -160,6 +160,11 @@ async def on_receive(self, websocket, data):
 
     async def on_disconnect(self, websocket, close_code):
         self.task.cancel()
+        try:
+            await self.task
+        except asyncio.CancelledError:
+            pass        
+        
         with redys.v2.AClient() as bus:
             await bus.unsubscribe(self.hr.hid.EVENT_RESPONSE_UPDATE)
 
diff --git a/htagweb/server/__init__.py b/htagweb/server/__init__.py
index 0ea0cd3..37f4f9b 100644
--- a/htagweb/server/__init__.py
+++ b/htagweb/server/__init__.py
@@ -306,11 +306,13 @@ async def startServer():
 ##################################################################################
 async def stopServer(s):
 ##################################################################################
-    # clean all running process
-    await killall()
+    try:
+        # clean all running process
+        await killall()
 
-    # before stopping
-    s.stop()
+    finally:
+        # before stopping
+        s.stop()
 
 
 if __name__=="__main__":
diff --git a/htagweb/server/client.py b/htagweb/server/client.py
index fd7e2b5..92dcd2a 100644
--- a/htagweb/server/client.py
+++ b/htagweb/server/client.py
@@ -145,6 +145,6 @@ async def loop_tag_update(self, hrsocket, websocket):
                         break
                 await asyncio.sleep(0.1)
         except Exception as e:
-            print("**loop_tag_update, broken bus, will stop the loop_tag_update !**")
+            print(f"**loop_tag_update, broken bus, will stop the loop_tag_update (often a cancel error)!**")
         finally:
             await self._bus.unsubscribe(event)
\ No newline at end of file