Method has

lib/core/AxiosHeaders.js:171–185

(header, matcher)

  }

  has(header, matcher) {
    header = normalizeHeader(header);

    if (header) {
      const key = utils.findKey(this, header);

      return !!(
        key &&
        this[key] !== undefined &&
        (!matcher || matchHeaderValue(this, this[key], key, matcher))
      );
    }

    return false;
  }

  delete(header, matcher) {
    const self = this;