HTTP has been gradually adding lots of new and exotic headers, and more are on the way. Learn about current best practices with Vary, Link, Content-Security-Policy, Referrer-Policy, Client-Hints, Clear-Site-Data and Alt-Svc, upcoming features such as Feature-Policy and proposals like Variants, Early-Hints, and Origin-Policy. HTTP gives you incredibly powerful control over many aspects of the way a browser will process the page and is often a more effective or more secure option than trying to achieve the same effect with tags or script on the page.


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