I've been tasked with parsing Apache web log files to extract data into another format. The customer provided me with the format line which includes the directive "%{c}a".
While I can find a definition for "%a" (the remote IP address), I cannot find any reference as to what the bracketed part means.
Does anyone recognize it and let me know what it represents?
From https://httpd.apache.org/docs/2.4/mod/mod_log_config.html#formats:
%{c}a Underlying peer IP address of the connection (see the mod_remoteip module).