Function FormatCloseMessage

conn.go:1219–1230

FormatCloseMessage formats closeCode and text as a WebSocket close message. An empty message is returned for code CloseNoStatusReceived.

(closeCode int, text string)

// FormatCloseMessage formats closeCode and text as a WebSocket close message.
// An empty message is returned for code CloseNoStatusReceived.
func FormatCloseMessage(closeCode int, text string) []byte {
	if closeCode == CloseNoStatusReceived {
		// Return empty message because it's illegal to send
		// CloseNoStatusReceived. Return non-nil value in case application
		// checks for nil.
		return []byte{}
	}
	buf := make([]byte, 2+len(text))
	binary.BigEndian.PutUint16(buf, uint16(closeCode))
	copy(buf[2:], text)
	return buf
}