Kerio Tech 6 - page 127

8.5 HTTP cache

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Warning

Some web servers may attempt to bypass the cache by too short/long TTL.

•Ignore server Cache-Control directive —WinRoute will ignore directives for cache

control of Web pages.

Pages often include a directive that the page will not be saved into the cache.

This directive page may be misused for example to bypass the cache. Enable

the Ignore server Cache-Control directive option to make WinRoute accept only

no-store and private directives.

Note: WinRoute examines HTTP header directives of responses, not Web pages.

•Always validate ﬁle in cache — with each query WinRoute will check the server for

updates of objects stored in the cache (regardless of whether the client demands

this).

Note: Clients can always require a check for updates from the Web server (regardless of the

cache settings). Use combination of the Ctrl and the F5 keys to do this using either the Internet

Explorer or the Firefox/SeaMonkey browser. You can set browsers so that they will check

for updates automatically whenever a certain page is opened (then you will only refresh the

particular page).

URL Speciﬁc Settings

The default cache TTL of an object is not necessarily convenient for each page. You may

require not to cache an object or shorten its TTL (i.e. for pages that are accessed daily).

Use the URL speciﬁc settings button to open a dialog where TTL for a particular URL can be

deﬁned.

Figure8.17 HTTPcache — speciﬁc settings for URL