src/main/java/io/netty/handler/codec/http/router/MethodlessRouter.java
public void removeTarget(T target) {
        first.removeTarget(target);
        other.removeTarget(target);
        last.removeTarget(target);
    }
public void removeTarget(T target) {
        first.removeTarget(target);
        other.removeTarget(target);
        last.removeTarget(target);
    }
Removes all routes leading to the target.