# Errors

The ABCC API uses HTTP status codes to indicate the success or failure status of an API request.

* Return HTTP 2XX to indicate that the API request was successful
* Returning HTTP 4XX indicates that error information was provided when requesting the API, such as missing parameters, parameter errors, and account balance errors, etc.
* Returning HTTP 5XX indicates that the server sent an error during the API request.

| Error Code | Meaning               | MeaningDescription                                                                              |
| ---------- | --------------------- | ----------------------------------------------------------------------------------------------- |
| 200        | OK                    | request is normal                                                                               |
| 201        | Created               | request is normal                                                                               |
| 400        | Bad Request           | request is normal                                                                               |
| 401        | Unauthorized          | is generally caused by missing parameters and incorrect parameter format                        |
| 402        | Request Failed        | The parameter format is correct but the request failed, usually caused by business logic errors |
| 403        | Forbidden             | Forbidden to access                                                                             |
| 404        | Not Found             | The requested resource does not exist                                                           |
| 405        | Method Not Allowed    | Attempt to use a method not allowed by the server                                               |
| 406        | Not Acceptable        | The requested format parameter is incorrect                                                     |
| 410        | Gone                  | Request has been removed!                                                                       |
| 429        | Too Many Requests     | Too Many Requests!                                                                              |
| 500        | Internal Server Error | The server is abnormal, please try again later (uncontrollable abnormality of the server)       |
| 503        | Service Unavailable   | The server is under maintenance, please try again later (Server controllable exception)         |

**Error return format**

| Return attribute | Is it necessary? | Meaning                                          |
| ---------------- | ---------------- | ------------------------------------------------ |
| code             | Yes              | Error code, the error code defined by the server |
| message          | Yes              | return a specific error description              |