PROBLEM
The Telerik.Web.UI.WebResource.axd handler can return uncompressed content for browsers that accept gzip encoding and vice versa
SOLUTION
Either upgrade your Telerik.Web.UI assembly to version
2009.3.1118 or higher.
Or, add this code to your
Global.asax file:
C#
VB.NET
UPDATE (11/18/2009): The Accept-Encoding header has been removed from the VaryByHeaders property as this is preventing Internet Explorer 6 from caching the response.