cnp3-ebook

protocols/tls

French

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The ``Server Name Indication (SNI)`` extension defined in :rfc:`6066` is an important TLS extension for web servers. It is used by the client to indicate the name of the server that it wishes to contact. The IP address associated to this name has been queried from the DNS and used to establish the TCP connection. Why should the client indicate the server name in the TLS ``ClientHello`` ? The motivation is the same as for the ``Host`` header line in HTTP/1.0. With the SNI extension, a single TLS server can support several web sites that use different domain names. Thanks to the SNI extension, the server knows the concerned domain name at the start of the TLS session. Without this extension, hosting providers would have been forced use one IP address per TLS-enabled server.

4 years ago

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