code: function(setting, value) {
          if (-1 === this._supportedPostParams.indexOf(setting)) {
              this.console.error('Parameter unsupported, may cause error:', setting);
          }
          this._reqParam[setting] = value;
          return this;
      }
docs: Set a Google Closure Compiler request parameter.
  @param {string} setting
  @param {string|Array} value
  @return {GccRest}