How to redirect to an external link with Spring Webflow?

Below you can find an easy way to redirect to an external site via a Spring Webflow view state. What happens here is the following:

1. a JSF command link backing bean action method returns the String link1
2. Spring Webflow will redirect you to the viewstate OpenLink1
3. The OpenLink1 view-state uses the externalRedirect functionality with a backingbean/dataholder stored link value