java - Spring Cloud Gateway - 尝试读取 Web 过滤器中的请求正文时请求卡住

Question

我是 Spring Cloud Gateway 的新手(spring boot 2.0.5.RELEASE)。我尝试从网络过滤器读取请求正文，但请求被卡住，无法流经链。示例代码:

@Component
public class TestFilter implements GlobalFilter, Ordered {

    private static final Logger logger = LoggerFactory.getLogger(TestFilter.class);

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest serverHttpRequest = exchange.getRequest();
        try {
            /* whenever I put the following line. The request cannot get through */
            ByteBuffer byteBuffer = Mono.from(serverHttpRequest.getBody()).toFuture().get().asByteBuffer();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return chain.filter(exchange);
    }
}

如果我删除 getBody() 行，一切都会正常。有什么线索吗？谢谢!

Answer 1

看看这里:How can I read request body multiple times in Spring 'HandlerMethodArgumentResolver'?

这句话解释得非常准确:

The biggest problem is that I find out that HttpServletRequest(get from NativeWebRequest) cannot read input stream(some parameters are in the request body) more than one time