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Asked: 2026-05-16T04:12:40+00:00

I’m trying to do some caching using VaryByParam AND VaryByHeader. When an AJAX request

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I’m trying to do some caching using VaryByParam AND VaryByHeader. When an AJAX request comes in I return a partial XHTML. When a regular request comes in I send the partial XHTML page with header / footer.

I tried to cache the page by doing:

[OutputCache( Duration = 5, VaryByParam = "nickname,page", VaryByHeader = "X-Requested-With" )]

However this doesn’t work… if I do a regular request first then run the AJAX call I get the full cached page instead of the partial and vice-versa. Seems like VaryByHeader is being ignored. Is it because X-Requested-With is omitted on normal requests? Or perhaps it’s doing VaryByParam OR VaryByHeader?

My obvious way around this is for AJAX requests to call a different method which only returns partial pages, however I’d like to avoid that if possible.

I’m using ASP.NET MVC 1.0 with the OutputCacheAttribute.

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1 Answer

  1. Editorial Team

    According to this MSDN reference, multiple values in VaryByParam should be semicolon separated, not comma separated.

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