check auth is properly set

app.py

@@ -97,9 +97,11 @@ class BZHStableSignatureDemo(object):
         }
         
         headers = {}
-        api_key = os.environ.get('BZH_API_KEY', None)
+        api_key = os.getenv('BZH_API_KEY')
+        print("api_key = ", api_key)
         if api_key:
             headers['BZH_API_KEY'] = api_key
+        print("headers = ", headers)
         response = requests.post('https://bzh.imatag.com/bzh/api/v1.0/detect',
                                  json=data, headers=headers)
         response.raise_for_status()