Support
In 2004, a patch for adding TLS/SNI into OpenSSL was created by the EdelKey project. In 2006, this patch was then ported to the development branch of OpenSSL, and in 2007 it was back-ported to OpenSSL 0.9.8.
To support SNI the TLS library used by an application must support it and the application must pass the hostname to the TLS library. Further complicating matters the TLS library may be either shipped as part of the application or may be a component of the operating system. As a result of this some browsers support SNI on all operating systems while others only support it on a subset of operating systems. As of 2011 most web browsers and TLS libraries have implemented support for SNI but there are still a large number of users still using combinations of browser and operating system that do not support it.
Read more about this topic: Server Name Indication
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