Fix aiohttp example's background task (Fixes miguelgrinberg#881)

miguelgrinberg · miguelgrinberg · commit fb9648575ef5 · 2022-02-28T14:17:00.000Z
diff --git a/examples/server/aiohttp/app.py b/examples/server/aiohttp/app.py
@@ -78,6 +78,10 @@ def disconnect(sid):
 app.router.add_get('/', index)
 
 
-if __name__ == '__main__':
+async def init_app():
     sio.start_background_task(background_task)
-    web.run_app(app)
+    return app
+
+
+if __name__ == '__main__':
+    web.run_app(init_app())
