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Google, GitHub and others leverage conditional HTTP requests to build APIs

quadratic.fm

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Re: Google, GitHub and others leverage conditional HTTP requests to build APIs

#4
The If-Modified-Since and If-Unmodified-Since precondition headers seem useful not only for APIs but also for web crawlers. Assuming bots follow some protocol that uses these tags, if you have lots of rarely-updated pages, it could save you some bandwidth.