Function fetchWithRedirects

apps/api/src/controllers/tools.controller.ts:342–471

(
  url: string,
  maxRedirects: number = MAX_REDIRECTS,
)

}

async function fetchWithRedirects(
  url: string,
  maxRedirects: number = MAX_REDIRECTS,
): Promise<{
  finalUrl: string;
  redirectChain: RedirectHop[];
  html: string;
  headers: Headers;
  statusCode: number;
  timing: DetailedTiming;
}> {
  const redirectChain: RedirectHop[] = [];
  let currentUrl = url;
  let finalHeaders: Headers | null = null;
  let finalStatusCode = 0;
  let finalHtml = '';
  const totalStartTime = Date.now();

  let dnsTime = 0;
  let connectTime = 0;
  let tlsTime = 0;
  let ttfbTime = 0;

  try {
    const urlObj = new URL(currentUrl);
    const hostname = urlObj.hostname;
    const port = urlObj.port
      ? Number.parseInt(urlObj.port, 10)
      : urlObj.protocol === 'https:'
        ? 443
        : 80;

    const dnsStart = Date.now();
    await dns.resolve4(hostname).catch(() => {});
    dnsTime = Date.now() - dnsStart;

    if (port === 443 || port === 80) {
      const connTiming = await measureConnectionTime(hostname, port);
      connectTime = connTiming.connectTime;
      tlsTime = connTiming.tlsTime;
    }
  } catch {
    // continue
  }

  let firstRequestStartTime = 0;

  for (let i = 0; i < maxRedirects; i++) {
    const controller = new AbortController();
    const timeout = setTimeout(() => controller.abort(), TIMEOUT_MS);

    try {
      const hopStartTime = Date.now();
      if (i === 0) {
        firstRequestStartTime = hopStartTime;
      }

      const response = await fetch(currentUrl, {