Ensure javascript is cached in browser in ASP.NET MVC app

I have a web app written in ASP.NET MVC 3.0. There are some largish scripts (jQuery, jQuery UI) which I want to ensure are cached for best performance. In the Chrome Developer Tools Network tab the scripts always take around 1.5 seconds to be received when a page is loaded. I would assume if they are 开发者_Go百科cached this would be near instant.

Is there any way to ensure javascript is being cached and how to tell if it is or isn't?

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For JQuery in particular it is better to use someone elses CDN - you will not have to stream this content from your server AND caching is properly done by someone else. See http://docs.jquery.com/Downloading_jQuery for recommended CDNs.

For files that you have to host yourself make sure you set correct caching headers.

• For static content you need to rely on server (likley IIS in ASP.Net case) to set correct headers - see http://support.microsoft.com/kb/247404 for some detais, search for "iis cache control" to get more links.
• For dynamic content choose needed values OutputCache attributes or set headers yourself (i.e. see http://www.asp.net/mvc/tutorials/improving-performance-with-output-caching-cs ).