code: function getAuthorizationHeader(realm, parameters) {
          var header = 'OAuth realm="' + OAuth.percentEncode(realm) + '"';
          var list = OAuth.getParameterList(parameters);
          for (var p = 0; p < list.length; ++p) {
              var parameter = list[p];
              var name = parameter[0];
              if (name.indexOf("oauth_") == 0) {
                  header += ',' + OAuth.percentEncode(name) + '="' + OAuth.percentEncode(parameter[1]) + '"';
              }
          }
          return header;
      }
docs: Construct the value of the Authorization header for an HTTP request.