%a "%r" %s %b "%{Content-Length}i" "%{Referer}i" "%{User-Agent}i" %T

ZO_HTTP_ACCESS_LOG_FORMAT="json"

{ "remote_ip": "%a", "request": "%r", "status": %s, "response_size": %b, "request_size": "%{Content-Length}i", "referer": "%{Referer}i", "user_agent": "%{User-Agent}i", "response_time_secs": %T }

ZO_HTTP_ACCESS_LOG_FORMAT='"%r" took: %T'

%a - Remote IP address
%t - Time when the request was received
%r - First line of request
%s - Response status code
%b - Size of response in bytes, excluding HTTP headers
%U - URL path requested
%T - Time taken to serve the request, in seconds
%D - Time taken to serve the request, in microseconds
%i - Header line(s) from request
%o - Header line(s) from response
%{Content-Length}i - Size of request payload in bytes
%{Referer}i - Referer header
%{User-Agent}i - User-Agent header