Spring Cloud Netflix The code preventing SimpleHostRoutingFilter from running doesn't work

I set "RequestContext.getCurrentContext().setRouteHost(null)" to prevent SimpleHostRoutingFilter from running, but the Filter is still working. (Rerence code : https://cloud.spring.io/spring-cloud-netflix/multi/multi__router_and_filter_zuul.html#zuul-developer-guide-sample-route-filter)

I have seen the same issues on online communities, but i haven't the solution about that anywhere.

Comment From: spencergibb

That's not enough information. What version are you using? What is your configuration? What is the order of your custom filter?

Comment From: yesesyo

@spencergibb I set "RequestContext.getCurrentContext().setRouteHost(null)" in my custom route filter(extends ZuulFilter) to route another destination instead of the original destination written in application.yml.

When RequestContext.getCurrentContext().setRouteHost(null) , I expected routing services about the original destination written in application.yml doesn't work, but the routing services are still working.

Spring Cloud Version : Greenwich.SR2
Spring Boot Version : 2.1.8.RELEASE

// The original destination written in application.yml

zuul:
  routes:
   service-a:
     path: /api/**
   service-b:
     path: /api/**

// The custom route filter

   @Override
    public String filterType() {
        return ROUTE_TYPE;
    }

    @Override
    public int filterOrder() {
        return SIMPLE_HOST_ROUTING_FILTER_ORDER - 1;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext context = RequestContext.getCurrentContext(); 
        context.setRouteHost(null); // prevent SimpleHostRoutingFilter from running

        return null;
    }

Comment From: spencergibb

My guess is the ordering is wrong, can you verify that your custom filter run() is run before SimpleHostRoutingFilter.shouldFilter()

Comment From: spring-projects-issues

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Comment From: spring-projects-issues

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