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Server Name Indication
What is Server Name Indication?
Server Name Indication, or SNI, is an extension to the TLS protocol that allows a single server to securely host multiple domains. With SNI, a client can request a specific host to the server, in which case the server can respond with the appropriate certificate for the given host. With SNI, a single server can serve www.example.com and www.example.org over HTTPS, with different certificates.