This plugin enables WordPress to send HSTS header to browser
Note: Enabling HSTS header will prevent user to open your WordPress site without https.
HTTP Strict Transport Security (HSTS) is a web security policy mechanism that helps to protect websites against protocol downgrade attacks and cookie hijacking.
It allows web servers to declare that web browsers (or other complying user agents) should interact with it using only secure HTTPS connections, and never via the insecure HTTP protocol
You can read the details at https://kevinhq.com/plugin-review/simple-hsts-preload-plugin/
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