RE: ServerAndClient Caching

Hi, I too have seen the same problem and raised it as a bug with MS. (It also
appears in the .NET 2.0 Framework).

What is happening is that under this scenario the Vary: * HTTP header is
being returned to the browser. This completely invalidates any client
caching. It does not happen for Location="Client" or Location="Any".

My bug report is here:
http://connect.microsoft.com/VisualS...dbackID=254940

There is a workaround, but unfortunately it must be added to every page. (Or
you could do it via an HTTPModule for every page).
Add the line:

Response.Cache.SetOmitVaryStar(true);

and this will fix it!