Why do HLS video segments cache so well on a CDN?

Options

• ✓ Each segment is a small, immutable file that is identical for every viewer Correct
• ✗ Segments are encrypted per viewer
• ✗ Segments are generated live for each request
• ✗ CDNs store whole movies in one object

Why

A segment never changes once written, so it can be cached for a long time with no invalidation. Every viewer of a popular video asks for the same files, so the edge serves almost all of them.

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