AddPrefix adds a 2-byte prefix with the DNS message length.

QUICCodeInternalError signals that the DoQ implementation encountered an internal error and is incapable of pursuing the transaction or the connection.

QUICCodeNoError is used when the connection or stream needs to be closed, but there is no error to signal.

QUICKeepAlivePeriod is the value that we pass to *quic.Config and that controls the period with with keep-alive frames are being sent to the connection.

12*5 = 60min.

define in config/config.go.