User manual

Phase 2: Setting up with the Web browser
Cobalt CacheRaQ 4 User Manual 23
This look-ahead feature shows the greatest performance improvements on
high-latency links. Normally, a client Web browser connects to a remote server to
download the Web page; if the page has referenced objects, the client’s browser
may make a new connection to retrieve each object. With the look-ahead feature,
the CacheRaQ 4 retrieves the referenced objects while the Web page is still
downloading to the client’s browser. With this feature enabled, the CacheRaQ 4
can retrieve multiple objects with fewer connections than if the feature is not
enabled.
PAC file URL
Web clients often use proxy auto-configuration (PAC) files to forward requests to
an appropriate proxy server or to determine how to redirect Web requests.
In the URL field, enter a URL specifying the location of the PAC file that the
CacheRaQ 4 will use.
PAC refresh rate
You can specify the refresh rate in minutes, hours or days. This value specifies
the period after which the CacheRaQ 4 re-examines the PAC file. If you enter “0”
in this field, the CacheRaQ 4 retrieves the PAC file only when it is booted.
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