Function safeFetch

packages/cli/src/capture/assetDownloader.ts:346–364

(url: string, init?: RequestInit)

 * or on network error.
 */
export async function safeFetch(url: string, init?: RequestInit): Promise<Response | null> {
  let current = url;
  for (let hop = 0; hop <= MAX_FETCH_REDIRECTS; hop++) {
    if (isPrivateUrl(current)) return null;
    const res = await fetch(current, { ...init, redirect: "manual" });
    if (res.status >= 300 && res.status < 400) {
      const loc = res.headers.get("location");
      if (!loc) return res;
      try {
        current = new URL(loc, current).toString();
      } catch {
        return null; // malformed Location header
      }
      continue;
    }
    return res;
  }
  return null; // too many redirects
}

async function fetchBuffer(url: string): Promise<Buffer | null> {
  try {