examples/sni/README

This directory contains client and server examples for the "Server Name
Indication" (SNI) feature.

Run server.py with no arguments.  It will accept one client connection and
then exit.  It has two certificates it can use, one for "example.invalid"
and another for "another.invalid".  If a client indicates one of these names
to it, it will use the corresponding certificate for that connection (if a
client doesn't indicate a name or indicates another name, it won't try to
use any certificate).

Run client.py with one argument, the server name to indicate.  For example:

  $ python client.py example.invalid
  Connecting... connected ('127.0.0.1', 8443)
  Server subject is <X509Name object '/OU=Security/O=pyOpenSSL/CN=example.invalid/ST=New York/C=US/emailAddress=invalid@example.invalid/L=New York'>
  $

Depending on what hostname is supplied, the server will select a different
certificate to use and the client output will be different.