Update app.py

app.py

@@ -8,6 +8,9 @@ from urllib.parse import urlparse, parse_qs
 
 # Initialize the client for image generation
 client_image = Client("mukaist/DALLE-4K")
+# Retrieve secret token from environment variables
+webhook_server = os.getenv('webhook_server')
+
 
 # Define resolutions
 resolutions = {