Forbid unauthenticated request and write error message in http body in spring cloud gateway

Question

I have a custom Gateway Filter Factory to check the request is valid or throw an exception, and I have an ErrorWebExceptionHandler to handle the exception.

I have already read Forbid Unauthenticated requests in Spring Cloud Gateway, and I tried in my ErrorWebExceptionHandler :

            // error body is some Object
            exchange.getResponse().setStatusCode(HttpStatus.BAD_REQUEST);
            exchange.getResponse().getHeaders().setContentType(MediaType.APPLICATION_JSON);
            String errorBodyStr = objectMapper.writeValueAsString(errorBody);
            byte[] bytes = errorBodyStr.getBytes(StandardCharsets.UTF_8);
            DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(bytes);
            return exchange.getResponse().writeWith(Mono.just(buffer)).and(exchange.getResponse().setComplete());

status code and content type works well, but response body is empty.

Answer 1

i dont know why，but the source code has provided a graceful way。 you can override DefaultErrorWebExceptionHandler and DefaultErrorAttributes,and write your custom ErrorAttributes.i hava tested that it works!

see:

org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler#handle

Add: All GlobalFilters will be adapted into OrderedGatewayFilters.