SpringBoot和ProtoBuf:如何通过在响应体中添加错误来使HTTP400更有用？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
    <groupId>com.google.protobuf</groupId>
    <artifactId>protobuf-java</artifactId>
</dependency>

syntax = "proto3";

message Error {
    string message = 1;
    repeated string details = 2;
}

protoc --java_out=<output_directory> <proto_file>.proto

public class BadRequestException extends RuntimeException {
    private Error error;

    public BadRequestException(Error error) {
        this.error = error;
    }

    public Error getError() {
        return error;
    }
}

@GetMapping("/example")
public ResponseEntity<ExampleResponse> getExample() {
    // 如果请求参数无效，创建一个错误消息
    Error error = Error.newBuilder()
            .setMessage("Invalid request")
            .addDetails("Parameter 'foo' is required")
            .build();

    // 抛出自定义异常
    throw new BadRequestException(error);
}

@ControllerAdvice
public class CustomExceptionHandler {
    @ExceptionHandler(BadRequestException.class)
    public ResponseEntity<Error> handleBadRequestException(BadRequestException ex) {
        Error error = ex.getError();
        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(error);
    }
}