Method has

packages/common/http/src/params.ts:200–203

* Reports whether the body includes one or more values for a given parameter. * @param param The parameter name. * @returns True if the parameter has one or more values, * false if it has no value or is not present.

(param: string)

   * false if it has no value or is not present.
   */
  has(param: string): boolean {
    this.init();
    return this.map!.has(param);
  }

  /**
   * Retrieves the first value for a parameter.