This commit introduces explicit HEAD support in Spring
MVC's ResourceHttpRequestHandler and WebFlux's ResourceWebHandler,
adding just headers but no body.
Closes gh-28291
This commit contains changes made because of the introduction of
HttpStatusCode. In general, methods that used to return a HttpStatus
now return HttpStatusCode instead, and methods that returned raw status
codes are now deprecated.
See gh-28214
DefaultHandlerExceptionResolver now supports ErrorResponse exceptions
and can map them to HTTP status and headers of the response. This
includes not only exceptions from spring-web, but also any other
exception that implements ErrorResponse.
ResponseEntityExceptionHandler is updated along the same lines, now
also handling any ErrorResponseException. It can be used it for
RFC 7807 support for Spring MVC's own exceptions.
See gh-27052
All Spring MVC exceptions from spring-web, now implement ErrorResponse
and expose HTTP error response information, including an RFC 7807 body.
See gh-27052
ErrorResponse represents a complete error response with status, headers,
and an RFC 7807 ProblemDetail body.
ErrorResponseException implements ErrorResponse and is usable on its
own or as a base class. ResponseStatusException extends
ErrorResponseException and now also supports RFC 7807 and so does its
sub-hierarchy.
ErrorResponse can be returned from `@ExceptionHandler` methods and is
mapped to ResponseEntity.
See gh-27052
ProblemDetail is a representation of an RFC 7807 "problem", and this
commits adds support for it in Spring MVC and WebFlux as a return value
from `@ExceptionHandler` methods, optionally wrapped with
ResponseEntity for headers.
See gh-27052
This commit also applies additional clean-up tasks such as the following.
- final fields
- diamond operator (<>) for anonymous inner classes
- try with resources
- multi-catch
This has only been applied to `src/main/java`.
