2XX success
- 200 OK, it means that the request from the client is processed correctly on the server
- 204 No content, indicating that the request is successful, but the response message does not contain the body of the entity
- 206 Partial Content, make a scope request
3XX redirect
- 301 moved permanently, a permanent redirect, indicating that the resource has been assigned a new URL
- 302 found, temporary redirect, indicating that the resource is temporarily assigned a new URL
- 303 see other, indicating that there is another URL for the resource, and the GET method should be used to target the resource
- 304 not modified, indicating that the server allows access to resources, but the request does not meet the conditions
- 307 temporary redirect, temporary redirect, has the same meaning as 302
4XX client error
- 400 bad request, there is a syntax error in the request message
- 401 unauthorized, indicating that the request sent needs to have authentication information authenticated by HTTP
- 403 forbidden, indicating that access to the requested resource was denied by the server
- 404 not found, indicating that the requested resource was not found on the server
5XX server error
- 500 internal sever error, indicating that an error occurred on the server side while executing the request
- 503 service unavailable, indicating that the server is temporarily overloaded or is shutting down for maintenance and cannot process the request
https://www.cnblogs.com/purewhite/p/10871851.html#_label0 reproduced