Update app.py

app.py

@@ -775,7 +775,7 @@ def build_demo(models):
 
 if __name__ == "__main__":
 
-    controller_url = "http://34.121.2.150:80"
+    controller_url = "http://34.173.116.249:80"
     host = "0.0.0.0"
 
     concurrency_count = 10