Agent: Fix mypy error in http_tools.py

monkey/infection_monkey/exploit/tools/http_tools.py

@@ -3,6 +3,7 @@ import urllib.error
 import urllib.parse
 import urllib.request
 from threading import Lock
+from typing import Optional, Tuple
 
 from infection_monkey.network.firewall import app as firewall
 from infection_monkey.network.info import get_free_tcp_port
@@ -28,7 +29,7 @@ class HTTPTools(object):
     @staticmethod
     def create_locked_transfer(
         host, dropper_target_path, agent_binary_repository, local_ip=None, local_port=None
-    ) -> LockedHTTPServer:
+    ) -> Tuple[Optional[str], Optional[LockedHTTPServer]]:
         """
         Create http server for file transfer with a lock
         :param host: Variable with target's information