iRule to log HTTP request as Apache combined standard format

Hello,

I used this iRule to log HTTP as Apache combined format. Why i have twice every log? F5 LTM is configuered to log to a remote syslog server.

iRule Irule_log_combined:

when HTTP_REQUEST { set host [HTTP::host] set username [HTTP::username] set client_IP [IP::client_addr] set request "\"[HTTP::method] [HTTP::uri] HTTP/[HTTP::version]\"" set request_time [clock clicks -milliseconds] set referer [HTTP::header "Referer"] set ua [HTTP::header "User-Agent"] textset xff [HTTP::header "X-Forwarded-For"] } when HTTP_RESPONSE { set response_time [expr [clock clicks -milliseconds] - $request_time] set now [clock format [clock seconds] -format "%d/%b/%Y:%H:%M:%S %z"] set contentlength [HTTP::header "Content-Length"] set status [HTTP::status]

log local0. "$host $client_IP $username $now $request $status $contentlength \"$referer\" \"$ua\" \"$xff\" $response_time" 

}

log output: 2014-03-11T10:33:41.000+01:00 172.19.208.17 canal_ip5_4200LB tmm[9451]: Rule /SRO01_OTT/Irule_log_combined : webtv-live-hss-m1.direct-ip5.canal-plus.com 194.4.235.1%201 11/Mar/2014:10:33:41 +0100 "GET /live/hss/canalplus-hd.isml/QualityLevels(96000)/Fragments(vo=244855920800474) HTTP/1.1" 200 25331 "myreferer" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0" "myforwardedip" 2 2014-03-11T10:33:41.000+01:00 172.19.208.17 canal_ip5_4200LB info tmm[9451]: Rule /SRO01_OTT/Irule_log_combined : webtv-live-hss-m1.direct-ip5.canal-plus.com 194.4.235.1%201 11/Mar/2014:10:33:41 +0100 "GET /live/hss/canalplus-hd.isml/QualityLevels(96000)/Fragments(vo=244855920800474) HTTP/1.1" 200 25331 "myreferer" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0" "myforwardedip" 2

2014-03-11T10:33:41.000+01:00 172.19.208.17 canal_ip5_4200LB tmm6[9457]: Rule /SRO01_OTT/Irule_log_combined : webtv-live-hss-m1.direct-ip5.canal-plus.com 194.4.235.1%201 11/Mar/2014:10:33:41 +0100 "GET /live/hss/canalplus-hd.isml/QualityLevels(3889)/FragmentInfo(captfra=244855920996586) HTTP/1.1" 200 198 "myreferer" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0" "myforwardedip" 0 2014-03-11T10:33:41.000+01:00 172.19.208.17 canal_ip5_4200LB info tmm6[9457]: Rule /SRO01_OTT/Irule_log_combined : webtv-live-hss-m1.direct-ip5.canal-plus.com 194.4.235.1%201 11/Mar/2014:10:33:41 +0100 "GET /live/hss/canalplus-hd.isml/QualityLevels(3889)/FragmentInfo(captfra=244855920996586) HTTP/1.1" 200 198 "myreferer" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0" "myforwardedip" 0

Advice please?