Function convertHeaderObject

lib/internal/inspector/network_http.js:40–69

(headers = kEmptyObject)

// Convert a Headers object (Map<string, number | string | string[]>) to a plain object (Map<string, string>)
const convertHeaderObject = (headers = kEmptyObject) => {
  // The 'host' header that contains the host and port of the URL.
  let host;
  let charset;
  let mimeType;
  const dict = {};
  for (const { 0: key, 1: value } of ObjectEntries(headers)) {
    const lowerCasedKey = key.toLowerCase();
    if (lowerCasedKey === 'host') {
      host = value;
    }
    if (lowerCasedKey === 'content-type') {
      const result = sniffMimeType(value);
      charset = result.charset;
      mimeType = result.mimeType;
    }
    if (typeof value === 'string') {
      dict[key] = value;
    } else if (ArrayIsArray(value)) {
      if (lowerCasedKey === 'cookie') dict[key] = value.join('; ');
      // ChromeDevTools frontend treats 'set-cookie' as a special case
      // https://github.com/ChromeDevTools/devtools-frontend/blob/4275917f84266ef40613db3c1784a25f902ea74e/front_end/core/sdk/NetworkRequest.ts#L1368
      else if (lowerCasedKey === 'set-cookie') dict[key] = value.join('\n');
      else dict[key] = value.join(', ');
    } else {
      dict[key] = String(value);
    }
  }
  return [dict, host, charset, mimeType];
};

/**
 * When a client request is created, emit Network.requestWillBeSent event.