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[ci skip] docs can URL cache invalidation

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schneems 2014-08-24 15:44:32 -05:00
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guides/source/asset_pipeline.md
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@ -1094,6 +1094,30 @@ asset for up to a year. Since most CDNs also cache headers of the request, this
the browser then knows that it can store this asset for a very long time before
needing to re-request it.
##### CDNs and URL based Cache Invalidation
Most CDNs will cache contents of an asset based on the complete URL. This means
that a request to
```
http://mycdnsubdomain.fictional-cdn.com/assets/smile-123.png
```
Will be a completely different cache from
```
http://mycdnsubdomain.fictional-cdn.com/assets/smile.png
```
If you want to set far future `max-age` in your `Cache-Control` (and you do).
Then make sure when you change your assets that your cache is invalidated. For
example when changing the smiley face in an image from yellow to blue, you want
all visitors of your site to get the new blue face. When using a CDN with a the
Rails asset pipeline `config.assets.digest` is set to true by default so that
each asset will have a different file name when it is changed. This way you
don't have to ever manually invalidate any items in your cache. By using a
different unique asset name instead, your users get the latest asset.
Customizing the Pipeline
------------------------