SNI from a server

[kazu-yamamoto]

RFC6066 says:

A server that receives a client hello containing the "server_name"
extension MAY use the information contained in the extension to guide
its selection of an appropriate certificate to return to the client,
and/or other aspects of security policy. In this event, the server
SHALL include an extension of type "server_name" in the (extended)
server hello. The "extension_data" field of this extension SHALL be
empty.

But I cannot find the code to send an empty SNI from a server to a client. Is this intentional? Or is it just missing?

[vdukhovni]

It does seem sensible to acknowledge receipt of the extension, regardless of whether it is actually used to determine a corresponding certificate or security policy. That way, clients are less likely to spuriously abort the connection if they choose to insist on the extension ACK. So I would view a PR that implements the sending of an empty extension favourably, if such functionality is not yet present.

[kazu-yamamoto]

OK. I will implement it.

[ocheron]

Fixed with #178.