Request class

1. Properties
2. error
3. onError
4. onSuccess
5. readyState
6. result
7. source
8. transaction
9. hashCode
10. on
11. runtimeType
12. Methods
13. addEventListener
14. dispatchEvent
15. noSuchMethod
16. removeEventListener
17. toString
18. Operators
19. operator ==
20. Constants
21. errorEvent
22. successEvent