Method normalize

lib/core/AxiosHeaders.js:230–255

(format)

  }

  normalize(format) {
    const self = this;
    const headers = {};

    utils.forEach(this, (value, header) => {
      const key = utils.findKey(headers, header);

      if (key) {
        self[key] = normalizeValue(value);
        delete self[header];
        return;
      }

      const normalized = format ? formatHeader(header) : String(header).trim();

      if (normalized !== header) {
        delete self[header];
      }

      self[normalized] = normalizeValue(value);

      headers[normalized] = true;
    });

    return this;
  }

  concat(...targets) {
    return this.constructor.concat(this, ...targets);