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Is it possible to set Expires caching headers for static content in _layouts and the Style Library?

Currently, each page request generates about 100 requests for static content like CSS, images and JavaScript, each resulting in a Not Modified response from the server. But these 100 requests are having an impact on the perceived performance of the site.

I have static content deployed to both _layouts (non-modifiable content) and the Style Library (modifiable content). Some of this content is themes for jQuery components, some is custom JavaScript, some is images used for with CSS.

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I have the same question myself and when I get some time I plan on looking at Disk Based Caching for Binary Large Objects. If you do give it a try it would be good to hear how it worked.

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  • Actually, this works quite nicely. Enabling the SharePoint BLOb cache and setting the max-age to something did the trick. – ScarePoint Mar 31 '11 at 9:54
  • @ScarePoint how did you set the "max-age", directly in IIS? – Meryovi Oct 18 '12 at 14:26
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You would add max-age directly in the web.config of the IIS site for the SharePoint site in the

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