spring-boot - Spring Boot + webflux：无法解析带有名称的视图

Question

我需要用图像 jpeg 数据来响应

@Controller
@RequestMapping("/resource")
class ResourceController() {

    @GetMapping("/thumbnail/{userFileId}/{group}/{index}", produces = [MediaType.IMAGE_JPEG_VALUE])
    suspend fun getThumbnail(
        @PathVariable userFileId: String,
        @PathVariable group: String,
        @PathVariable index: Int,
        response: ServerHttpResponse
    ) {
        val url = service.getThumbnailUrl(userFileId, group, index)
            ?: throw ResponseStatusException(HttpStatus.NOT_FOUND)

        response.headers.contentType = MediaType.IMAGE_JPEG
        response.statusCode = HttpStatus.OK
        streamResponse(url, response)
    }
}

    @Throws(ResponseStatusException::class)
    private fun streamResponse(url: String, response: ServerHttpResponse) {
        ....
        response.headers.contentLength = contentLength
        content.use { content -> 
            response.writeWith(
                DataBufferUtils.readInputStream({ content }, response.bufferFactory(), 128)
            ).subscribe()
        }
    }

它可以工作，但控制台中出现错误：

Could not resolve view with name 'resource/thumbnail/xxx/common/2'

同样的方法适用于spring-boot-starter-web.

不幸的是，我找不到如何使用 spring boot + kotlin + webflux 的文档