Capturing specific HTTP Request and Response

Hi I have a Capturing specific HTTP Request and Response Headers How i can Capturing only response for the request?

when CLIENT_ACCEPTED {
  set transfers_flag 0
  set secs [clock seconds]
  set msec [clock clicks -milliseconds]
  set secs1000 [expr { $secs * 1000 } ]
  set fract [expr { $msec - $secs1000 }]
  if { $fract >= 1000 } {
    set diff [expr { $fract / 1000 }]
    incr secs $diff
    incr fract [expr { -1000 * $diff }]
  }
  set tcp_start_time [clock format $secs -format {%H:%M:%S}].$fract
  set hsl [HSL::open -publisher /Common/syslog-publisher]
  set FrontEndIP "FrontEndIP: Client:[IP::client_addr]:[TCP::client_port]->[clientside {IP::local_addr}]:[clientside {TCP::local_port}]"
  set Session_info "$tcp_start_time | $FrontEndIP"
  set Transfers_headers $Session_info
}

when HTTP_REQUEST {
  set Http_Host_Uri "Http-Method-Host-Uri: [HTTP::method] [HTTP::host][HTTP::uri]" 
  if { ([HTTP::uri] starts_with "/MyAPP") && ([HTTP::uri] contains "iflock=3") } {
    set transfers_flag 1
    append Transfers_headers "  HTTP_REQ_transfersMyApp_headers >> "
    foreach aHeader [HTTP::header names] {
        append Transfers_headers "  Header_name:$aHeader Value:[HTTP::header value $aHeader] "
    }
    append Transfers_headers " endof HTTP_REQ_transfer headers "
  }
  append Session_info " >> $Http_Host_Uri"
  log local0. $tcp_start_time||$Http_Host_Uri
}

when HTTP_RESPONSE {
    if { $transfers_flag } {
        set Response_code [HTTP::status]
        append Transfers_headers "  Response_code: $Response_code  HTTP_RESP_transfersMyApp_headers >> "
        foreach aHeader [HTTP::header names] {
            append Transfers_headers "  Header_name:$aHeader Value:[HTTP::header value $aHeader] "
        }
        append Transfers_headers " endof HTTP_RESP transfer headers "
    }
}

when CLIENT_CLOSED {
    if { [info exists transfers_flag] && $transfers_flag } {
        log local0. transfers_flag_exists_$transfers_flag 
        HSL::send $hsl "<190> $Transfers_headers"
    }
}