Update app.py

app.py

@@ -8,7 +8,7 @@ import requests
 
 
 def face_recognition_on_file(file1, file2):
-    url = f"{BACKEND_URL}/face_recognition"
+    url = f"{backend_url}/face_recognition"
     try:
         files = {'file1': open(file1, 'rb'), 'file2': open(file2, 'rb')}
 
@@ -28,7 +28,7 @@ def face_recognition_on_file(file1, file2):
 
 
 def liveness_detection_on_file(file):
-    url = f"{BACKEND_URL}/check_liveness"
+    url = f"{backend_url}/check_liveness"
     try:
         files = {'file': open(file, 'rb')}
         r = requests.post(url=url, files=files)