I saw this discussion today and made this change based on what was discussed. It is the default behaviour, so the result is that /my-page and /my-context/my-page work when base-url is specified.
It will not override the context set by the container so should not affect those already running inside Tomcat or Jetty but I haven't tested this so you may want to check before releasing.
adding routing to allow base-url to work with a standalone app
Looks good, thanks!