Example One; Example Two; Minimum Expiration Time - Nortel BayStack Instant Internet 100-S Using Manual

If you use the Aggressive level with a text expiration of 100%, the Instant Internet
unit subtracts the text entry's last modified date and time (which is always
stamped on the entry) from the current date and time. If a request for that entry
comes within 100% of the time before the calculated expiration time, the cached
entry is sent to the user.

Example one

A user requests a Web page of Shakespeare's sonnets called sonnets.html at noon
on 7/4/2000 that has a last modified date and time of 48 hours ago at noon on
7/2/2000. With the Aggressive text expiration set to 100%, the sonnets.html page
will expire 48 hours into the future at noon on 7/6/2000. In this case, the cached
entry is sent to the user.

Example two

The sonnets.html Web page that a user requested at noon on 7/4/2000 contains a
picture of William Shakespeare called bard.gif that has a last modified date and
time of 365 days ago at noon on 7/4/1999. With the Aggressive non-text
expiration set to 200%, the bard.gif file will expire 730 days into the future at
noon on 7/4/2002. In this case, the cached entry is sent to the user.

Minimum expiration time

The minimum expiration time (entered in minutes) specifies how the Instant
Internet unit extends the freshness time of a text or non-text entry after it is
downloaded and cached. You can set a minimum time extension so that regardless
of what the calculation is for the expiration percent, the Instant Internet unit uses
the following formula:
minimum expiration time = minimum number of minutes after an entry
expires before it is checked against the originating Web server
Set this value lower if users consistently request information that changes often,
for example stock quotes. Set it higher if users request information that does not
change often, for example, Shakespeare's sonnets.
If the calculated time is less than the minimum value, the minimum value is used
("Example one" on page
value, the calculated time is used
Using the BayStack Instant Internet Management Software Version 7.11
Chapter 7 Web cache configuration
211). If the calculated time is more than the minimum
("Example two" on page
211
211).