Add SNI post.

diff --git a/posts/SNI.mdwn b/posts/SNI.mdwn
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+[[!meta  title="Name-Based Virtual Hosts with SSL/TLS on Apache"]]
+
+Despite [some Apache comments to the contrary][contrary], it *is*
+possible to use Apache to host several SSL/TLS hosts on the same
+IP/port combination.  The key is [Server Name Indication][SNI] (SNI),
+in which the client indicates the host name with which it wants to
+connect explicitly.  The details for implementing SNI-support, see the
+[Apache Wiki][apache-wiki] and the [Gentoo wiki][gentoo-wiki].
+
+
+[contrary]: http://httpd.apache.org/docs/2.0/ssl/ssl_faq.html#vhosts
+[SNI]: http://en.wikipedia.org/wiki/Server_Name_Indication
+[apache-wiki]: http://wiki.apache.org/httpd/NameBasedSSLVHostsWithSNI
+[gentoo-wiki]: http://en.gentoo-wiki.com/wiki/Apache2/SSL_and_Name_Based_Virtual_Hosts
+
+[[!tag tags/linux]]
+[[!tag tags/programming]]