URI scheme and plain HTTP (an insecure URI beginning with "http://").

If a user types in a URI or clicks on a link that refers to the insecure variant, the browser will automatically redirect to the secure version in case the website is contained in the HSTS preload list shipped with the application or if the user had already visited the origin in the past.

Otherwise the website will be contacted over HTTP. A website operator may decide to serve such requests by redirecting

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