guipengfei opened a new issue, #11913:
URL: https://github.com/apache/dubbo/issues/11913
环境：dubbo 3.0.8 + nacos 2.1.0
需求概述：自定义路由，根据前端传的参数，动态选择符合条件的provider
consumer端配置：
dubbo.application.version=comsumer-1.0.0
provider老版本配置：
dubbo.application.version=provider-1.0.0
provider新版本配置：
dubbo.application.version=provider-2.0.0
provider端新老版本同时提供服务，根据前端的version参数，动态调用对应的provider
以下为自定义路由的伪代码：
```
@Activate(group = CommonConstants.CONSUMER)
public class MyRouterFactory extends CacheableRouterFactory {
@Override
protected Router createRouter(URL url) {
return new MyRouter();
}
}
public class MyRouter extends AbstractRouter {
public MyRouter() {
setPriority(100);
}
@Override
public <T> RouterResult<Invoker<T>> route(List<Invoker<T>> invokers, URL
url, Invocation invocation, boolean needToPrintMessage) throws RpcException {
// 前端动态传递的版本号
String version =
RpcContext.getServiceContext().getAttachment("version");
if (StrUtil.isNotEmpty(version)) {
// 符合条件的invokers
List<Invoker<T>> targetInvokers = new ArrayList<>();
for(Invoker<T> invoker: invokers) {
//
**问题：这里取到的版本号，始终是consumer端的comsumer-1.0.0，而不是期望的provider-1.0.0/provider-2.0.0**
String currentVersion =
invoker.getUrl().getParameter("application.version");
// TODO 根据provider的版本号判断是否符合
// ...
}
return new RouterResult<>(targetInvokers);
}
return new RouterResult<>(invokers);
}
}
```
按理List<Invoker<T>>
invokers是所有可调用的provider集合，但为何里面的参数信息，不是对应的provider端的，该如何才能取到呢？
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