Simplify APIRequestReason.
Simplify APIRequestReason.

Combined `parseResponseFailed` and `unrecognizedErrorCode` into `unrecoginzedError`.

nixzhu/MonkeyKing,nixzhu/MonkeyKing,nixzhu/MonkeyKing,nixzhu/MonkeyKing,fyl00/MonkeyKing,fyl00/MonkeyKing,fyl00/MonkeyKing,fyl00/MonkeyKing