Explain content delivery networks.
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Understand the problem
cdn
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Attempt it yourself
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Study the solution
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Read the code
Cache-Control headers (origin response)
// Static, versioned asset (filename has a content hash) -> cache forever:
Cache-Control: public, max-age=31536000, immutable
// HTML that may change -> let the CDN serve stale briefly while refreshing:
Cache-Control: public, max-age=0, s-maxage=60, stale-while-revalidate=300
// Per-user / private data -> never cache at the shared edge:
Cache-Control: private, no-store05
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