<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.0.RELEASE</version>
</parent>
 <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
  </dependencies>
-Java Code-
  @RequestMapping(value = "/bad-token", method = RequestMethod.GET)
    public void bad(HttpServletResponse response) throws IOException {
        response.sendError(401, "this is bad token");
        return;
and i find the ‘message’ in the api result info is blank，like that
-2.3.0-
    "timestamp": "2020-11-05T09:44:45.497+0000",
    "status": 401,
    "error": "Unauthorized",
    "message": "",
    "path": "/bad"
this problem has not occurred in previous versions , i switched to 2.2.10.RELEASE and i got the 'message'
-2.2.10-
    "timestamp": "2020-11-05T09:44:45.497+0000",
    "status": 401,
    "error": "Unauthorized",
    "message": "this is bad token",
    "path": "/bad"
I tested and found this problem in any version  greater than 2.3.0.RELEASE.

I'm not sure it is a bug
          
This is the expected default behaviour in Spring Boot 2.3. Please see the relevant section of the release notes for details.
Originally posted by @wilkinsona in #22049 (comment)