Function encode 

pub fn encode(frame: &Frame) -> Result<Vec<u8>, CodecError>

Encodes a Frame into the WebSocket wire byte slice.

If frame.masking_key is set, the payload is XOR-masked during encoding (Spec §5.3).

Errors

• CodecError::ControlFrameTooLong if a control frame has a payload > 125 bytes (Spec §5.5).
• CodecError::FragmentedControlFrame if a control frame has FIN=0 (Spec §5.5).