HTTP::close timing out

My goal is to close the connection once sending the 200 response. I have created this iRule, however for some reasons its not working. app is observing timeouts once this rule applied to the virtual. Any inputs are appreciated!

when HTTP_REQUEST { if { [string tolower [HTTP::path]] equals "Healtch-Check-URL" } { if { [active_members [LB::server pool]] >= 1 } { HTTP::respond 200 content { OK } HTTP::close }

        else {
            HTTP::respond 500 content {
                NOT_OK
            }
            HTTP::close
        }

    }
    elseif { [active_members POOL_NAME] == 0 } {
        if { [HTTP::header exists x-gtm-dc-failure] }  {
            return
        }
        HTTP::header insert x-gtm-dc-failure true
    }
}