Long-Term Caching - CI/CD Glossary Definition

Long-term caching serves hashed assets with a far-future expiry so returning users skip the download entirely.

Long-term caching is serving static assets with a far-future cache lifetime so browsers reuse them across visits. It is safe only when filenames include a content hash that changes on every content change.

Pairing content-hashed filenames with a long max-age (often marked immutable) lets browsers cache assets for a year while still fetching updates when content changes. In CI, the production build produces the hashed filenames this strategy depends on.

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