Fix for rate limiter

openhands/server/middleware.py

@@ -58,6 +58,7 @@ def __init__(self, requests: int = 2, seconds: int = 1, sleep_seconds: int = 1):
         self.requests = requests
         self.seconds = seconds
         self.history = defaultdict(list)
+        self.sleep_seconds = sleep_seconds
 
     def _clean_old_requests(self, key: str) -> None:
         now = datetime.now()