StackOverflow2013

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Id
10160088
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2012-04-15T06:41:58.063
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2012-04-15T06:41:58.063
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text
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There are a few different answers to this question. First of all, if you have files which only change every once in a while, set the Expires and Cache-Control headers to expire in one year. Only if the files truly never expire should you say that they never expire. You're seeing the issues with saying "never expire" right now. Also, if you are having performance issues on your site from serving up lots of images and JavaScript, the commonly accepted solution is to use a CDN (Content Delivery Network). There are many different providers and I'm sure that you can find one that meets your budget. You'll also save money in the long run as the CDN will offload a great deal of I/O and CPU time from IIS. It's astounding how big of a difference it can make. Lastly, one way to make sure that users are getting the latest for your files which almost never change is to implement some sort of versioning scheme in your assets URLs to make cache busting happen. There are many different ways to do this, but one (very naive) way to do it is to have a version number that increases every time you deploy to your site. E.g. all your asset URLs will look like /static/123/img/dog_and_pony.jpg Then, next time you deploy to your site, you increase the version number so that it's "124". You would need some way to keep track of the version, dynamically injecting it into asset URLs, as well as making sure that the version number changes every time you deploy. The idea being that anything referencing this asset should automatically know the new version number. In terms of performance, it's an admirable goal to never need the user to refresh or have to download the same thing twice. But sometimes it's just a lot less hassle, and if users are only refreshing everything periodically, that's probably okay for most websites. Hope this helps.
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1. POASP.NET: How to enforce a reload of a web static file
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1. PTAnswer
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1. USbitops
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