覆盖zuul错误过滤器导致转发错误

Question

我正在尝试覆盖 zuul 代理的默认 senderorfilter，以便当我的网关后面的服务崩溃/关闭时，我可以提供更好的响应。这是我从Customizing Zuul Exception中的答案中获取的代码

public class RabbrErrorFilter extends ZuulFilter {

private static final Logger log = LoggerFactory.getLogger(RabbrErrorFilter.class);
protected static final String SEND_ERROR_FILTER_RAN = "sendErrorFilter.ran";

@Override
public String filterType() {
    return "post";
}

@Override
public int filterOrder() {
    return Integer.MIN_VALUE; // Needs to run before SendErrorFilter which has filterOrder == 0
}

@Override
public boolean shouldFilter() {
    // only forward to errorPath if it hasn't been forwarded to already
    RequestContext ctx = RequestContext.getCurrentContext();
    return ctx.containsKey("error.status_code") && !ctx.getBoolean(SEND_ERROR_FILTER_RAN,false);
}
@Override
public Object run() {
    try {
        RequestContext ctx = RequestContext.getCurrentContext();
        Object e = ctx.get("error.exception");

        if (e != null && e instanceof ZuulException) {
            ZuulException zuulException = (ZuulException)e;
            log.error("Zuul failure detected: " + zuulException.getMessage(), zuulException);

            // Remove error code to prevent further error handling in follow up filters
            ctx.remove("error.status_code");

            // Populate context with new response values
            ctx.setResponseBody("Overriding Zuul Exception Body");
            ctx.getResponse().setContentType("application/json");
            ctx.setResponseStatusCode(500); //Can set any error code as excepted
            ctx.setSendZuulResponse(false);
        }
    }
    catch (Exception ex) {
        log.error("Exception filtering in custom error filter", ex);
        ReflectionUtils.rethrowRuntimeException(ex);
    }
    return null;
}

我用调试器检查了 run() 中的代码在 zuul 异常被抛出时被执行，但是在控制台日志中我得到了这个：

com.netflix.zuul.exception.ZuulException: Forwarding error
    at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.handleException(RibbonRoutingFilter.java:157) ~[spring-cloud-netflix-core-1.1.0.RC2.jar:1.1.0.RC2]
    at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.forward(RibbonRoutingFilter.java:132) ~[spring-cloud-netflix-core-1.1.0.RC2.jar:1.1.0.RC2]
    at org.springframework.cloud.netflix.zuul.filters.route.RibbonRoutingFilter.run(RibbonRoutingFilter.java:78) ~[spring-cloud-netflix-core-1.1.0.RC2.jar:1.1.0.RC2]
    at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:112) ~[zuul-core-1.1.0.jar:1.1.0]
    at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:197) ~[zuul-core-1.1.0.jar:1.1.0]
    at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:161) ~[zuul-core-1.1.0.jar:1.1.0]
    at com.netflix.zuul.FilterProcessor.route(FilterProcessor.java:120) ~[zuul-core-1.1.0.jar:1.1.0]
    at com.netflix.zuul.ZuulRunner.route(ZuulRunner.java:96) ~[zuul-core-1.1.0.jar:1.1.0]
    at com.netflix.zuul.http.ZuulServlet.route(ZuulServlet.java:116) ~[zuul-core-1.1.0.jar:1.1.0]
    at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:81) ~[zuul-core-1.1.0.jar:1.1.0]

来自网关后面的服务的响应超时，状态为 500。

-- 编辑* 更新 spring-cloud 依赖项（包含 zuul 1.3.0 核心）并没有解决这个问题

Answer 1

请检查此解决方案：Spring Cloud: Zuul error handling。它对我有用，特别是对于 Zuul 的转发错误。

Zuul 错误处理通过 RibbonRoutingFilter 和 SendErrorFilter 进行处理，并将任何错误请求转发到 ${error.path}，默认为“/error”。如果您使用 Spring Boot 的 BasicErrorController 处理的默认值。您可以覆盖此行为并实现您自己的 ErrorController。

您不一定需要遵循 Vnd 错误样式，只需遵循编写 Spring 的 ErrorController 的自定义实现的一般逻辑即可。