gougouzcm commented on issue #1669: How can I know where I am called in a Router URL: https://github.com/apache/incubator-dubbo/issues/1669#issuecomment-384837642 @beiwei30 ``` public List<Invoker<T>> list(Invocation invocation) throws RpcException { if (destroyed) { throw new RpcException("Directory already destroyed .url: " + getUrl()); } List<Invoker<T>> invokers = doList(invocation); List<Router> localRouters = this.routers; // local reference if (localRouters != null && localRouters.size() > 0) { for (Router router : localRouters) { try { if (router.getUrl() == null || router.getUrl().getParameter(Constants.RUNTIME_KEY, false)) { invokers = router.route(invokers, getConsumerUrl(), invocation); } } catch (Throwable t) { logger.error("Failed to execute router: " + getUrl() + ", cause: " + t.getMessage(), t); } } } return invokers; } ``` I put the param Constants.RUNTIME_KEY true in url， so the router will be called every rpc request。 `RpcGrayContext.getGrayGroup()` was put in a web filter / or the `<dubbo:provider filter=grayFilter>` , It will be clean and set at that time 。 First , In my test , if ` router.getUrl().getParameter(Constants.RUNTIME_KEY, false) == true` , the router will be called every time. I had got a idea how to add grayRouter in [1622](https://github.com/apache/incubator-dubbo/issues/1622)。 The [conditional routing](http://dubbo.apache.org/books/dubbo-user-book/demos/routing-rule.html) is too complex for deal with gray request. many interface, many configures, and can't dynamic route gray request in One application.
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