What is the proper HTTP response to send for requests that require SSL/TLS

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I cannot say if this is broadly accepted by HTTP clients, but speaking strictly RFC, the server should respond with:

HTTP/1.1 426 Upgrade Required
Upgrade: TLS/1.0, HTTP/1.1
Connection: Upgrade

Source:
https://www.rfc-editor.org/rfc/rfc2817#section-4.2

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