- Kerio WinRoute Firewall Administrator's Guide

Chapter 5 Settings for Interfaces and Network Services

Memory cache size

Maximal memory cache size in the main storage. This cache is used especially to

accelerate records to the cache on the disk.

If the value is too high the host’s performance can be aﬀected negatively (cache size

should not exceed 10 per cent of the computing memory).

Max HTTP object size

maximal size of the object that can be stored in cache.

With respect to statistics, the highest number of requests are for small objects (i.e.

HTML pages, images, etc.). Big sized objects, such as archives (that are usually

downloaded at once), would require too much memory in the cache.

Cache Options

Advanced options where cache behavior can be deﬁned.

• Continue aborted download — tick this option to enable automatic download of

objects that have been aborted by the user (using the Stop button in a browser).

Users often abort downloads for slow pages. If any user attempts to open the

same page again, the page will be available in the cache and downloads will be

much faster.

• Cache redirect responses — HTTP responses that contain redirections will be

cached.

• Use server supplied Time-To-Live — objects will be cached for time speciﬁed by

the Web server from which they are downloaded. If TTL is not speciﬁed by the

server, the default TTL will be used (see the HTTP protocol TTL item).

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).