Function convertHeaderObject

lib/internal/inspector/network_http2.js:38–83

(headers = kEmptyObject)

// Convert a Headers object (Map<string, number | string | string[]>) to a plain object (Map<string, string>)
function convertHeaderObject(headers = kEmptyObject) {
  let scheme;
  let authority;
  let path;
  let method;
  let statusCode;
  let charset;
  let mimeType;
  const dict = {};

  for (const { 0: key, 1: value } of ObjectEntries(headers)) {
    const lowerCasedKey = key.toLowerCase();

    if (lowerCasedKey === HTTP2_HEADER_SCHEME) {
      scheme = value;
    } else if (lowerCasedKey === HTTP2_HEADER_AUTHORITY) {
      authority = value;
    } else if (lowerCasedKey === HTTP2_HEADER_PATH) {
      path = value;
    } else if (lowerCasedKey === HTTP2_HEADER_METHOD) {
      method = value;
    } else if (lowerCasedKey === HTTP2_HEADER_STATUS) {
      statusCode = value;
    } else if (lowerCasedKey === HTTP2_HEADER_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 === HTTP2_HEADER_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 === HTTP2_HEADER_SET_COOKIE) dict[key] = value.join('\n');
      else dict[key] = value.join(', ');
    } else {
      dict[key] = String(value);
    }
  }

  const url = `${scheme}://${authority}${path}`;

  return [dict, url, method, statusCode, charset, mimeType];
}

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