we do not support websocket subprotocols, but for compatibility with
current clients (novnc, pve-xtermjs) we have to reply with the one requested,
else this is a protocol error and browsers will error out
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
we never actually sent text frames, nor did any client request them.
Also, no validity check ever ocurred, so technically it was against
the spec.
Simply remove the code handling sending out text frames. If we need
to actually handle that, we can always create a 'WebSocketStringWriter'
or similar.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
