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?
curl 7.49.0-DEV (i686-w64-mingw32) libcurl/7.49.0-DEV mbedTLS/2.2.1
zlib/1.2.8 libidn/1.32 libssh2/1.7.0 nghttp2/1.9.2
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps
pop3 pop3s rtsp scp sftp smtp smtps telnet tftp
Features: AsynchDNS Debug TrackMemory IDN IPv6 Largefile SSPI Kerberos
SPNEGO NTLM SSL libz HTTP2
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