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HSTS

HSTS is a security header that can be added to a website's HTTP response.

This header tells browsers to always use HTTPS when connecting to the website, even if the user types in the URL incorrectly or if the website's certificate is not valid. This helps to protect websites from man-in-the-middle attacks, which are a type of attack where an attacker can intercept and modify traffic between a website and a user's browser.