Update app.py

app.py

@@ -8,6 +8,8 @@ import requests
 
 
 def face_recognition_on_file(file1, file2):
+    
+    backend_url = os.getenv('BACKEND_URL')
     url = f"{backend_url}/face_recognition"
     try:
         files = {'file1': open(file1, 'rb'), 'file2': open(file2, 'rb')}
@@ -28,6 +30,8 @@ def face_recognition_on_file(file1, file2):
 
 
 def liveness_detection_on_file(file):
+
+    backend_url = os.getenv('BACKEND_URL')
     url = f"{backend_url}/check_liveness"
     try:
         files = {'file': open(file, 'rb')}