Webflux等效于HttpServletResponse.sendError

Question

我目前正在从servlet切换到Spring Webflux，并使用Spring Cloud Gateway，并尝试编写GlobalFilter。

我的旧代码中有一部分在过滤器链中执行有关请求的断言，并返回错误：

  override fun doFilterInternal(request: HttpServletRequest, response: HttpServletResponse, filterChain: FilterChain) {
    // various assertions on request
    if (assertionsFailed) {
      response.sendError(...)
      ...
    }

我当前的代码结构如下：

  @Bean
  fun preFilter(): GlobalFilter {
    return GlobalFilter { exchange, chain ->
      Mono.create<Void> { sink ->
        // perform some processing on exchange.request
        ...
        // trying to accomplish something similar to this
        exchange.sendError(statusCode, MyErrorModel(reason))

        sink.success()
      }.then()
    }
  }

在此阶段如何以类似方式正确返回错误？