pub const PROTOCOL_VERSION: u32 = 4;Expand description
Protocol version sent to clients. This can be used to indiciate new or
changed capabilities that clients may wish to leverage.
1 - Initial protocol version
2 - Addition of serve.compressed property to control whether servermsg’s
are compressed bidirectionally.
3 - The server’s connection token is set to a SHA256 hash of the tunnel ID
4 - The server’s msgpack messages are no longer length-prefixed