HTTP status code classification
HTTP status code consists of three decimal digits. The first decimal digit defines the type of status code. The last two digits have no classification effect. HTTP status codes are divided into 5 types:
| Category | Category Description |
| 1** | Information, the server received the request and the requester needs to continue to perform the operation |
| 2** | Success, the operation was successfully received and processed |
| 3** | Redirect, further action is required to complete the request |
| 4** | Customer Terminal error, the request contains a syntax error or the request cannot be completed |
| 5** | Server error, an error occurred while the server was processing the request |
