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Improve Asset Pipeline documentation [ci-skip] #44482

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18 changes: 7 additions & 11 deletions guides/source/asset_pipeline.md
Expand Up @@ -865,23 +865,19 @@ config.asset_host = ENV['CDN_HOST']
NOTE: You would need to set `CDN_HOST` on your server to `mycdnsubdomain
.fictional-cdn.com` for this to work.

Once you have configured your server and your CDN when you serve a webpage that
has an asset:
Once you have configured your server and your CDN, asset paths from helpers such
as:

```erb
<%= asset_path('smile.png') %>
```

Instead of returning a path such as `/assets/smile.png` (digests are left out
for readability). The URL generated will have the full path to your CDN.
Will be rendered as full CDN URLs like `http://mycdnsubdomain.fictional-cdn.com/assets/smile.png`
(digest omitted for readability).

```
http://mycdnsubdomain.fictional-cdn.com/assets/smile.png
```

If the CDN has a copy of `smile.png` it will serve it to the browser and your
server doesn't even know it was requested. If the CDN does not have a copy it
will try to find it at the "origin" `example.com/assets/smile.png` and then store
If the CDN has a copy of `smile.png`, it will serve it to the browser, and your
server doesn't even know it was requested. If the CDN does not have a copy, it
will try to find it at the "origin" `example.com/assets/smile.png`, and then store
it for future use.

If you want to serve only some assets from your CDN, you can use custom `:host`
Expand Down