Function fetchProxiedPreviewMedia

fetchProxiedPreviewMedia(
upstreamUrl: string,
rangeHeader: string,
): Promise<Response>
Proxies a ranged media request to a YouTube CDN URL for browser preview playback.
Parameters
- upstreamUrl: string
  Direct media URL from yt-dlp.
- rangeHeader: string
  Optional HTTP Range request header from the browser.
Returns Promise<Response>
Upstream response body and status streamed to the client.
- Defined in lib/youtube-import/proxy-preview-media.ts:49