> Hi everyone! I have the following problem:
> I don't want any of my site's pages to be saved on any browser's cache.
> Yet, I want all HTML forms to keep their data when the user changes to
> another page without submiting and then comes back using the back button.
>
> I have seen changing the session.cache_limiter configuration option to
> 'private' instead of 'nocache' works to make all forms keep their data, but
> then all pages are diplayed from the browser's cache even after refreshing
> several times!. I want a point in between, but I don't know how to get
> there.
>
> By the way, do you know what do the values that session.cache_limiter can
> take mean? (nocache, private and public)
When you set it to 'nocache' you get a set of HTTP headers that look like
this:
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
That forces things to not be cached anywhere.
The 'private' setting sends these headers:
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: private, max-age=10800, pre-check=10800
The expires header is set to a time in the past to force non-HTTP 1.1
compliant caches not to cache the page. For HTTP-1.1 caches that
understand the cache-control header the page will be cached only in
private caches (ie. the end-user http-1.1 compliant browser) for the time
specified by the session.cache_expire setting.
The 'public' setting sends headers like this:
Expires: Thu, 19 Apr 2001 20:57:16 GMT
Cache-Control: public, max-age=10800
Basically this means that the page is allowed to be cached in both public
(like AOL's proxy-cache) and private caches for the time specified by
session.cache_expire
And no, I don't know of a way to do what you want. I don't think you can
have the back button working and at the same time not allow private
caching.
-Rasmus
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