Logging Of Traffic Logs For HTTP Connection

when RULE_INIT {
     Save the name of the BIG-IP
    set static::bigip [info hostname]
     Set the log facility
     Ex: <191> = local7.debug
     See RFC 3164 Section 4.1.1 - "PRI Part" or https://devcentral.f5.com/wiki/iRules.HSL__send.ashx for more info
    set static::facility <191>
     Add the facility and hostname to the log prefix
    set static::hsl_prefix "$static::facility|host=$static::bigip"
}
when CLIENT_ACCEPTED {
     Open a new high speed logging connection to the syslog pool named syslog_server_pool
    set hsl [HSL::open -proto UDP -pool syslog_server_pool]
     Append the client IP:port to a local copy of the log prefix so we can log it in SERVER_CLOSED
    set hsl_prefix "${static::hsl_prefix}|client=[IP::client_addr]:[TCP::client_port]"
}
when HTTP_REQUEST {
     Get time for start of HTTP request
    set http_request_time [clock clicks -milliseconds]
    set url "[HTTP::host][HTTP::uri]"
}
when HTTP_RESPONSE {
     Received the response headers from the server.  Log the pool name, IP and port, status and 
     time delta between HTTP request headers received from client and respnse headers recieved from server
    HSL::send $hsl "$hsl_prefix|event=HTTP_RESPONSE|url=$url|vs=[clientside {IP::local_addr}]:[clientside {TCP::local_port}]\
        |http_status=[HTTP::status]|http_request_response_delta_ms=\
        [expr {[clock clicks -milliseconds] - $http_request_time}]|desc=HTTP response|\n"
}