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体验新版 GitCode,发现更多精彩内容 >>
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80f777e1
编写于
7月 23, 2016
作者:
S
Santosh Wadghule
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Add documentation for `http_cache_forever`. [ci skip]
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guides/source/caching_with_rails.md
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@@ -512,6 +512,30 @@ class ProductsController < ApplicationController
end
```
Sometimes we want to cache response, for example a static page, that never gets
expired. To achieve this, we can use
`http_cache_forever`
helper and by doing
so browser and proxies will cache it indefinitely.
By default cached responses will be private, cached only on the user's web
browser. To allow proxies to cache the response, set
`public: true`
to indicate
that they can serve the cached response to all users.
Using this helper,
`last_modified`
header is set to
`Time.new(2011, 1, 1).utc`
and
`expires`
header is set to a 100 years.
WARNING: Use this method carefully as browser/proxy won't be able to invalidate
the cached response unless browser cache is forcefully cleared.
```
ruby
class
HomeController
<
ApplicationController
def
index
http_cache_forever
(
public:
true
)
do
render
end
end
end
```
### Strong v/s Weak ETags
Rails generates weak ETags by default. Weak ETags allow semantically equivalent
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