SpringBoot web: ResponseStatusException does not pass its 'reason' to end client

I noticed that the text field reason of this exception did not returned in web response: neither in body, nor in headers. I ask about it because of the putting the "result code" (enum value) into this field may help in describing the contract of API. For example this field may contain BAD_COUNTRY or BAD_PHONE_NUMBER in case of processing user's registration form. Both exceptions produce 400 error code. I checked tomcat and jetty (spring-boot 3.0.1, SpringMVC) - the both do not process this field.

Is it a bug?

Comment From: wilkinsona

Spring Boot's DefaultErrorAttributes will use the reason from a ResponseStatusException as the value of its message. Note that message will only be included in the error response when enabled. This can be done by setting server.error.include-message to always.

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