Understanding HTTP Caching: A Guide to RFC 9111 and Cache-Control Headers
By
danburzo
A five-star bake. Worth schmearing, sharing, saving.
Summary
This article provides a comprehensive guide to HTTP caching based on RFC 9111 (2022), explaining how the Cache-Control header works in HTTP responses. It covers caching directives, validation mechanisms, and practical implementation strategies for web developers. The content serves as both a refresher and educational resource on modern HTTP caching standards and best practices.
Key quotes
· 4 pulledThe standard defines the Cache-Control HTTP header as a way to prescribe how caches should store and reuse HTTP responses, with regard to not just the browser cache, but to any other intermediary caches, such as proxies and content delivery networks, that may exist between the client and the origin server.
The Cache-Control header accepts a set of comma-separated directives, some of which are meant to be added to HTTP requests, and others to HTTP responses.
This is a fresh reading of RFC 9111 (2022), the latest iteration of the HTTP Caching standard.
Let's relearn web caching together.
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