Time for action – enabling user agent logging
By default, the user agent log is disabled and we can enable it by using the following line in our configuration file:
useragent_log /opt/squid/var/logs/useragent.log
Once we have the user agent log enabled, Squid will start logging the User-Agent HTTP header field from the requests, depending on the availability of the field. Let's see a few lines from an example user agent log:
127.0.0.1 [12/Sep/2010:01:55:33 +0530] "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 GTB7.1" 127.0.0.1 [12/Sep/2010:01:55:33 +0530] "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 GTB7.1 GoogleToolbarFF 7.1.20100830 GTBA"
The format of this file is quite simple ...
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