diff --git a/oauth2client/appengine.py b/oauth2client/appengine.py
index 5cd3f4b..a001350 100644
--- a/oauth2client/appengine.py
+++ b/oauth2client/appengine.py
@@ -798,14 +798,18 @@
     url = self.flow.step1_get_authorize_url()
     return str(url)
 
-  def http(self):
+  def http(self, *args, **kwargs):
     """Returns an authorized http instance.
 
     Must only be called from within an @oauth_required decorated method, or
     from within an @oauth_aware decorated method where has_credentials()
     returns True.
+
+    Args:
+        args: Positional arguments passed to httplib2.Http constructor.
+        kwargs: Positional arguments passed to httplib2.Http constructor.
     """
-    return self.credentials.authorize(httplib2.Http())
+    return self.credentials.authorize(httplib2.Http(*args, **kwargs))
 
   @property
   def callback_path(self):