Squid Proxy Server 3.1 Beginner's Guide

Time for action – learning log format and format codes

Log format can be defined using the logformat directive available in the Squid configuration file. The syntax for defining logformat is as follows:

logformat <name> <format specification>

Format specification is a series of format code, as described in the following information:

Format code	Format description
%	A literal % character.
sn	Unique sequence number per log line entry.
err_code	The ID of an error response served by Squid or a similar internal error identifier.
err_detail	Additional err_code dependent error information.
>a	Client's source IP address.
>A	Client's FQDN (Fully Qualified Domain Name).
>p	Client's source port.
<A	Server's IP address or ...