IIS Compression Module and Vary: Accept-Encoding Header

Question

Is there a way to change the IIS compression module so that it does not put in Vary: Accept-Encoding in the Response Headers? I would rather it put in Vary: * or do nothing and

Answer 1

This issue is now addressed by an official patch to IIS. To download and further info, visit http://support.microsoft.com/kb/2877816

Erez Benari, IIS PM

Answer 2

Ok, apparently the IIS compression module forces the Vary header to be Accept-Encoding no matter what, so caching becomes tricky. For pages with authentication this is bad, because it will not detect that it's different based on the user cookie. I ended up rolling my own compression in my controller and everything works fine now.

My suggestion- only use IIS static compression, don't use dynamic compression and instead roll your own dynamic compression. It will save you pain in the long run and give you more control.