See https://tools.ietf.org/html/rfc7151 for details.
FEATcommand to be send before authentication, so that
HOSTsupport is detected.
Thanks for your suggestion. Do you know of any other use for "pre-login" commands, apart fromJust a thought, but what a few FTP clients have been doing is adding an option to send the HOST command before logging in, or providing support for sending custom pre-login commands. For example, in WinSCP's Advanced Site Settings, you could modify the Protocol Options page to add another text box for pre-login commands, or add you could an On/Off option to send a HOST command before logging in.
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