Ruby on Rails

On Apr 25, 2013, at 10:37 AM, Wins Lin wrote:

> I don't understand what is meant in Rails Guide about caching:
>
>>> Unfortunately, it can't be applied to every situation
>>> (such as pages that need authentication) and since the webserver is literally
>>> just serving a file from the filesystem, cache expiration is an issue
>>> that needs to be dealt with.
>
> What are "pages that require authentication"? Are they just the pages
> with a form for authentication? Like the main page of facebook.com when
> you are not logged in? Then why is it impossible to cache it? It is the
> best page for caching because it is always the same, it has only the
> html-form. Unlike the profile page that has a lot of fields that are
> changed very frequently.

No, it would be any page containing unique content meant for that user's eyes only. You can't cache them because they are bound to the current user's session -- you can only cache things that are meant for everyone to see. No filtering or special content-creation can be going on in any part of cached content. Now you can use what 37Signals refers to as "Russian Doll" cacheing to cache parts of the page that are held in common, while letting other parts be dynamically generated. It's a yes-and sort of thing. But if you are after a win by caching the entire page, then it has to be essentially a static page -- same for everyone who views it.

Walter

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