haproxy log-format generator

It would be nice if you could just check some boxes and get the fields you want from haproxy.

haproxy documentation for HTTPS log format

Lets output JSON so that we put very little work to do on our log parsers.

The log-format value:

haproxy log-format variables: %B - bytes_read (from server to client)
%CC - captured_request_cookie
%CS - captured_response_cookie
%H - hostname
%HM - HTTP method (ex: POST)
%HP - HTTP request URI without query string
%HPO - HTTP path only (without host nor query string)
%HQ - HTTP request URI query string (ex: ?bar=baz)
%HU - HTTP request URI (ex: /foo?bar=baz)
%HV - HTTP version (ex: HTTP/1.0)
%ID - unique-id
%ST - status_code
%T - gmt_date_time
%Ta - Active time of the request (from TR to end)
%Tc - Tc
%Td - Td = Tt - (Tq + Tw + Tc + Tr)
%Tl - local_date_time
%Th - connection handshake time (SSL, PROXY proto)
%Ti - idle time before the HTTP request
%Tq - Th + Ti + TR
%TR - time to receive the full request from 1st byte
%Tr - Tr (response time)
%Ts - timestamp
%Tt - Tt
%Tu - Tu
%Tw - Tw
%U - bytes_uploaded (from client to server)
%ac - actconn
%b - backend_name
%bc - beconn (backend concurrent connections)
%bi - backend_source_ip (connecting address)
%bp - backend_source_port (connecting address)
%bq - backend_queue
%ci - client_ip (accepted address)
%cp - client_port (accepted address)
%f - frontend_name
%fc - feconn (frontend concurrent connections)
%fi - frontend_ip (accepting address)
%fp - frontend_port (accepting address)
%ft - frontend_name_transport ('~' suffix for SSL)
%lc - frontend_log_counter
%hr - captured_request_headers default style
%hrl - captured_request_headers CLF style
%hs - captured_response_headers default style
%hsl - captured_response_headers CLF style
%ms - accept date milliseconds (left-padded with 0)
%pid - PID
%r - http_request
%rc - retries
%rt - request_counter (HTTP req or TCP session)
%s - server_name
%sc - srv_conn (server concurrent connections)
%si - server_IP (target address)
%sp - server_port (target address)
%sq - srv_queue
%sslc - ssl_ciphers (ex: AES-SHA)
%sslv - ssl_version (ex: TLSv1)
%t - date_time (with millisecond resolution)
%tr - date_time of HTTP request
%trg - gmt_date_time of start of HTTP request
%trl - local_date_time of start of HTTP request
%ts - termination_state
%tsc - termination_state with cookie status