Different Vary response header values

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We have a .Net MVC web application. I just noticed today the 'Vary' response header when using Fiddler.

For half the pages in our application, I see the value for this header is '*'

For rest of the pages, the value for this header is 'Accept-Encoding'

And for the css files in the application, the value for this header is 'User-Agent'.

I am curious to know where this value is being set. I don't see anything in the controller/action methods. Also, I would like to know what is the opposite of '*', is there a 'None'? (to say - always cache this file, don't worry about any of the headers)

Thanks.

asked 16 secs ago

user471317

373

Different Vary response header values