How SNI Fixes The Problem
An extension to TLS called Server Name Indication (SNI) addresses this issue by sending the name of the virtual domain as part of the TLS negotiation. This enables the server to select the correct virtual domain early and present the browser with the certificate containing the correct name. Therefore with clients and servers that support SNI a single IP address can be used to serve a group of domain names for which it is impractical to get a common certificate.
Read more about this topic: Server Name Indication
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