IE11 on Windows 7 does not cache files
问题 When examining cache behaviour on our web site I got a very confusing result - my Internet Explorer 11 browser did not cache any files at all. The cache settings in the Internet Option is set to "Check for newer versions of stored pages: Automatically". Investigating further with IE developer tool, all files were requested without an "if-modified-since" HTTP header, which of course caused the server to return the complete file with a 200 status result. Expected behaviour would be that IE