What status codes are received by Ajax success and error

Ajax and Http Status

Before always strange Ajax send a request after success and error demarcation status code is how much, mostly will Ajax tutorial also did not mention,
For example, I use ResponseEntity<Map>(map, HttpStatus.INTERNAL_SERVER_ERROR); (500) to respond, Ajax will use error to receive, and then in the forum to see the big guy said in the Ajax source code is indicated:

• Source Address: Https://github.com/jquery/jquery/blob/master/src/ajax.js

isSuccess = status >= 200 && status < 300 || status === 304;

Enum Httpstatus in Spring

• Official API Https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/http/HttpStatus.html

Http Status Code

What status codes are received by Ajax success and error