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

[bartdegoede]

https://quadratic.fm/p/how-meta-microsoft-google-github

[aendruk]

This article is just bait on a solicitation for your contact information.

[chipsa → aendruk]

It's got a standard substack pop over. You don't have to give it your info.

[plumeria]

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.