    # File estraierpure.rb, line 689
        def get_doc_attr_by_uri(uri, name)
          Utility::check_types({ uri=>String, name=>String }) if $DEBUG
          @status = -1
          return nil unless @url
          turl = @url + "/get_doc_attr"
          reqheads = [ "Content-Type: application/x-www-form-urlencoded" ]
          reqheads.push("Authorization: Basic " + Utility::base_encode(@auth)) if @auth
          reqbody = "uri=" + CGI::escape(uri) + "&attr=" + CGI::escape(name)
          resbody = StringIO::new
          rv = Utility::shuttle_url(turl, @pxhost, @pxport, @timeout, reqheads, reqbody, nil, resbody)
          @status = rv
          return nil if rv != 200
          resbody.string.chomp
        end