src/main/java/io/netty/handler/codec/http/router/MethodlessRouter.java
public MethodlessRouter<T> addRouteLast(String pathPattern, T target) {
        last.addRoute(pathPattern, target);
        return this;
    }
public MethodlessRouter<T> addRouteLast(String pathPattern, T target) {
        last.addRoute(pathPattern, target);
        return this;
    }
Adds route to the "last" section.

<p>A path pattern can only point to one target. This method does nothing if the pattern
has already been added.