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1. Check for redirects

If you see a 3xx status with a Location header, the URL redirects. Try the destination URL directly in this player instead. If the redirect response has no Access-Control-Allow-Origin header, the browser will block it regardless of the destination.

2. Check CORS and range support on the final URL

Look for:

• Access-Control-Allow-Origin: * (or your origin)
• Accept-Ranges: bytes

If either is missing, the server needs its CORS and/or range request configuration updated.

3. Check the preflight (OPTIONS) response

The response must include Access-Control-Allow-Headers that permits Range. Without this, the browser won't send range requests.