getting all headers from http request without using a loop

I am using the below irule to get all headers from every http request. Is there any other efficient way to do this for instance without using a loop. Any input is much appreciated

Present Irule

when HTTP_REQUEST {

    set HttpHeader " "
    set now [clock format [clock seconds] -format "%D %H:%M:%S %z"]
    set contentlength [HTTP::header "Content-Length"]    

    foreach aHeader [HTTP::header names] {
    append  HttpHeader $aHeader ":" [HTTP::header value $aHeader] "\r\n"        
    }           

        HSL::send $applayer_hsl "<190>\r\n$HttpHeader\r\nPath:[URI::path [HTTP::uri]][URI::basename [HTTP::uri]]\r\nQueryStr:[HTTP::query]\r\nHttpKalive:[HTTP::is_keepalive]\r\nHttpVer:[HTTP::version]\r\nF5Addr: [IP::local_addr]\r\nClientIP:[IP::client_addr]\r\nTime:$now\r\nPort:$ClientPort\r\nServer:[LB::server addr]\r\n"
    }

    when CLIENT_ACCEPTED {

    set applayer_hsl [HSL::open -proto UDP -pool hsl_8080_pool]     
    set ClientPort [TCP::local_port] 
   }