Update app.py

app.py

@@ -149,7 +149,7 @@ async def proxy_to_node(
 async def catch_all(request: Request, path: str):
     return await proxy_to_node(
         request,
-        request.client.host,
+        "0.0.0.0",
         4321,
         request.url.port,
         request.url.scheme,