diff --git a/science_article_wos/science_article_wos/middlewares.py b/science_article_wos/science_article_wos/middlewares.py
index 4704df6..b1afac3 100644
--- a/science_article_wos/science_article_wos/middlewares.py
+++ b/science_article_wos/science_article_wos/middlewares.py
@@ -109,6 +109,9 @@ class ScienceArticleWosDownloaderMiddleware:
 
 
 class WosStarterApiXkeyDownloaderMiddleware:
+    """
+    https://api.clarivate.com/swagger-ui/?apikey=none&url=https%3A%2F%2Fdeveloper.clarivate.com%2Fapis%2Fwos-starter%2Fswagger
+    """
     async def process_request(self, request, spider):
         key_param = {
             'X-ApiKey': '53b8164e7543ccebe489988287e8b871bc2c0880'
@@ -185,10 +188,13 @@ class WosCookieMiddleware:
     def get_sid_from_redis(self):
         val = self.redis_cli.rpoplpush(self.cookiepool_cache_key, self.cookiepool_cache_key)
         if val:
-            self.redis_cli.hincrby(f'{self.redis_key_prefix}:{val}', 'used_times', 1)
+            self.inc_used_times(val)
             return val
         return None
 
+    def inc_used_times(self, val: str = None):
+        self.redis_cli.hincrby(f'{self.redis_key_prefix}:{val}', 'used_times', 1)
+
     def mark_sid_status(self, sid: str, status: str = 'validate'):
         """
         :param sid:
@@ -221,6 +227,11 @@ class WosCookieMiddleware:
         self.redis_cli.delete(f'{self.cookiepool_cache_key}')
 
 
+class WosSessionMiddleware:
+    def process_request(self, request: Request, spider: Spider):
+        pass
+
+
 class A:
     def __init__(self, redis_cli):
         self.redis_cli = redis_cli