set_link (EstraierPure::Node)

    # File estraierpure.rb, line 951
        def set_link(url, label, credit)
          Utility::check_types({ url=>String, label=>String, credit=>Integer }) if $DEBUG
          @status = -1
          return false unless @url
          turl = @url + "/_set_link"
          reqheads = [ "Content-Type: application/x-www-form-urlencoded" ]
          reqheads.push("Authorization: Basic " + Utility::base_encode(@auth)) if @auth
          reqbody = "url=" + CGI::escape(url) + "&label=" + label
          reqbody += "&credit=" + credit.to_s if credit >= 0
          rv = Utility::shuttle_url(turl, @pxhost, @pxport, @timeout, reqheads, reqbody, nil, nil)
          @status = rv
          rv == 200
        end