anchor.diff:  
   %% @private
   %% Generates key "external_url" for http transports
  +%% Using external_host, external_port and external_path
   %% No final '/'
   resolve_external(#nkconn{transp=Transp}=Conn) when Transp==http; Transp==https ->
       #nkconn{ip=Ip, port=Port, opts=Opts} = Conn,
  
positive.code:         nklib_util:to_binary(Transp), "://",
          case maps:get(external_host, Opts, <<>>) of
              <<>> ->
                  nklib_util:to_host(Ip);
              ExtHost ->
                  ExtHost
          end,
  
negative.code:                 [":", integer_to_binary(MyPort)]
          end,
          filename:join([
              maps:get(external_path, Opts, "/"),
              maps:get(path, Opts, "/")
          ])
      ]),
      Ext2 = nklib_url:norm(Ext1),
  