Method has

packages/common/http/src/headers.ts:90–94

* Checks for existence of a given header. * * @param name The header name to check for existence. * * @returns True if the header exists, false otherwise.

(name: string)

   * @returns True if the header exists, false otherwise.
   */
  has(name: string): boolean {
    this.init();

    return this.headers.has(name.toLowerCase());
  }

  /**
   * Retrieves the first value of a given header.