Update app.py

app.py

@@ -66,8 +66,8 @@ def handle_gen(payload):
     
     # DOCKER FIX: Use the 'origin' header if available to set callback
     # If on HF, request.host_url works, but we provide a fallback
-    callback_base = request.host_url.replace("https://zenjoul80-suno-api.hf.space") 
-    payload['callBackUrl'] = callback_base + "callback"
+    callback_base = request.host_url.replace("https://zenjoul80-suno-api.hf.space/") 
+    payload['callBackUrl'] = "https://zenjoul80-suno-api.hf.space/callback"
     
     try:
         res = requests.post("https://api.sunoapi.org/api/v1/generate/upload-cover", json=payload, headers=headers)