With the coming of the Client Hints, Variants and Key specifications, there’s a lot to take in, and while it can be interesting to understand how the browser works under the hood, Andrew Betts shows you some simple things you can distil from it: Browsers ignore Vary for resources pushed using HTTP/2 server push, so don’t vary on anything you push. Vary is not as useful as it could be, and Key paired with Client Hints is starting to change that. Follow along with browser support to find out when you can start using them. And much more! Go forth and be variable.
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