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Format:
%% The percent sign
%a Remote IP-address (IP-address of proxy if using reverse proxy)
%t Time when the request was started to process
%P The process ID of the child that serviced the request
%r First line of request
%s Response status code
%b Size of response in bytes, including HTTP headers
%T Time taken to serve the request, in seconds
%Tf Time taken to serve the request, in seconds with floating fraction
in .06f format
%D Time taken to serve the request, in microseconds
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