Allow to query for server extensions available. - #591

Shouldn't we also be checking the server extensions when doing extended requests?

Shouldn't we also be checking the server extensions when doing extended requests?

I think that should be the responsibility of the user. We use it like

if supportsServerExtension("statvfs", "openssh.com")
    newExtendedRequest("statvfs@openssh.com")

Shouldn't we also be checking the server extensions when doing extended requests?

I think that should be the responsibility of the user. We use it like

if supportsServerExtension("statvfs", "openssh.com")
    newExtendedRequest("statvfs@openssh.com")

It would actually be good to guard against sending bad requests to the server, as we know which extended requests are available. I'll add that in a separate PR and merge this one, as it is a pre-existing situation.