1. Dart
2. dart:io
3. WebSocketStatus
4. MISSING_MANDATORY_EXTENSION constant

WebSocketStatus class

1. Constructors
2. WebSocketStatus
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Constants
12. ABNORMAL_CLOSURE
13. abnormalClosure
14. GOING_AWAY
15. goingAway
16. INTERNAL_SERVER_ERROR
17. internalServerError
18. INVALID_FRAME_PAYLOAD_DATA
19. invalidFramePayloadData
20. MESSAGE_TOO_BIG
21. messageTooBig
22. MISSING_MANDATORY_EXTENSION
23. missingMandatoryExtension
24. NO_STATUS_RECEIVED
25. NORMAL_CLOSURE
26. normalClosure
27. noStatusReceived
28. POLICY_VIOLATION
29. policyViolation
30. PROTOCOL_ERROR
31. protocolError
32. reserved1004
33. reserved1015
34. RESERVED_1004
35. RESERVED_1015
36. UNSUPPORTED_DATA
37. unsupportedData

static const int MISSING_MANDATORY_EXTENSION = missingMandatoryExtension