@Nullable
    @Override
    Integer getStatusCode0() {
        if (future.isDone() && !future.isCompletedExceptionally()) {
            return armeriaHeaders.status().code();
        }
        return null;
    }
A {@link ServerHttpResponse} implementation for the Armeria HTTP server.
spring/boot3-webflux-autoconfigure/src/main/java/com/linecorp/armeria/spring/web/reactive/ArmeriaServerHttpResponse.java