diff --git a/steam/client/builtins/web.py b/steam/client/builtins/web.py
index 345bf77..8a80919 100644
--- a/steam/client/builtins/web.py
+++ b/steam/client/builtins/web.py
@@ -5,13 +5,20 @@ from steam import webapi
 from steam.core.msg import MsgProto
 from steam.enums.emsg import EMsg
 from steam.core.crypto import generate_session_key, symmetric_encrypt
-from steam.util.web import make_requests_session
+from steam.util.web import make_requests_session, generate_session_id
 
 
 class Web(object):
+    _web_session = None
+
     def __init__(self, *args, **kwargs):
         super(Web, self).__init__(*args, **kwargs)
 
+        self.on(self.EVENT_DISCONNECTED, self.__handle_disconnect)
+
+    def __handle_disconnect(self):
+        self._web_session = None
+
     def get_web_session_cookies(self):
         """Get web authentication cookies via WebAPI's ``AuthenticateUser``
 
@@ -62,11 +69,15 @@ class Web(object):
         :return: authenticated Session ready for use
         :rtype: :class:`requests.Session`, :class:`None`
         """
+        if self._web_session:
+            return self._web_session
+
         cookies = self.get_web_session_cookies()
         if cookies is None:
             return None
 
-        session = make_requests_session()
+        self._web_session = session = make_requests_session()
+        session_id = generate_session_id()
 
         for domain in ['store.steampowered.com', 'help.steampowered.com', 'steamcommunity.com']:
             for name, val in cookies.items():
@@ -75,5 +86,6 @@ class Web(object):
 
             session.cookies.set('Steam_Language', language, domain=domain)
             session.cookies.set('birthtime', '-3333', domain=domain)
+            session.cookies.set('sessionid', session_id, domain=domain)
 
         return session
diff --git a/steam/util/web.py b/steam/util/web.py
index 44d70d8..33c4934 100644
--- a/steam/util/web.py
+++ b/steam/util/web.py
@@ -1,4 +1,6 @@
 import requests
+from binascii import hexlify
+from steam.core.crypto import sha1_hash, random_bytes
 
 def make_requests_session():
     """
@@ -13,3 +15,10 @@ def make_requests_session():
     session.headers['User-Agent'] = ua
 
     return session
+
+def generate_session_id():
+    """
+    :returns: session id
+    :rtype: :class:`str`
+    """
+    return hexlify(sha1_hash(random_bytes(32)))[:32]