APM cookie - F5_ST

i did the following to remove the cookie and the app works normal

when RULE_INIT {
     user-defined: APM virtual server to forward traffic to
    set static::LOCAL_APM_VIP "vs_server-apm"
}
when HTTP_REQUEST {
    virtual $static::LOCAL_APM_VIP
}
when HTTP_RESPONSE {
    if { [HTTP::cookie exists F5_ST] } {
        HTTP::cookie remove F5_ST
        }
}