> I've been monitoring some FTPS in Wireshark and one thing I've noticed 
> is the ClientHello contains the ALPN extension for http/1.1 and h2. Is 
> it acceptable to be sending that for protocols other than HTTP?

It is now; I've requested of IANA that "ftp" be registered as one of the
accepted ALPN extension names; see:

  
http://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids

Cheers,
TJ
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