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HTTPS

HTTPS is HTTP over an SSL protocol encrypted network connection, or, as formula: HTTPS = HTTP+SSL
Chromium and Firefox use NSS to implement SSL/TLS.

See also

RFC 2818 (HTTP Over TLS)
Let's Encrypt
Combining the .Net classes System.Net.Security.SslStream and System.Net.Sockets.TcpClient to produce a simple HTTPS client.

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