http header rewrite

when LB_SELECTED {
   if the node selected has the IP of the DR node...
  if { [IP::addr [IP::server_addr] equals 10.0.0.1] } {
    HTTP::header replace Host "nc-dot1-dr.abc.com"
    HTTP::header replace X-DOT "nc-dot1-dr.abc.com"
    HTTP::header replace responseURL "nc-dot1-dr.abc.com"
    STREAM::expression {@nc-dot1.abc.com@nc-dot1-dr.abc.com@}
  }
}

This might work, I am sketchy on the STREAM part.