diff --git a/api/app.py b/api/app.py
index fea35c036..709df205a 100644
--- a/api/app.py
+++ b/api/app.py
@@ -112,10 +112,10 @@ def edit_temp_json():
 def config(url):
     user_agent = request.headers.get('User-Agent')
     rua_values = os.getenv('RUA').split(',')
-    substrings = os.getenv('STR').split(',')
     if any(rua_value in user_agent for rua_value in rua_values):
         return Response(json.dumps({'status': 'error', 'message': 'block'}, indent=4, ensure_ascii=False),
                         content_type='application/json; charset=utf-8', status=403)
+    substrings = os.getenv('STR').split(',')
     if any(substring in url for substring in substrings):
         return Response(json.dumps({'status': 'error', 'message_CN': '填写参数不符合规范'}, indent=4, ensure_ascii=False),
                         content_type='application/json; charset=utf-8', status=403)