To enable server push for any navigation target in MPR, add the
@Push Flow annotation on the Flow application shell class. The application shell class is a plain Java class implementing the
@Push annotation has similar parameters (except for the deprecated ones) as the ones used in the Vaadin 7 and 8.
See Server Push for instructions how to configure push in Flow and the
@Push annotation JavaDoc for descriptions on each parameter.
When enabled, push uses the Flow implementation. Vaadin 7 or 8 push implementation isn’t used. That said, all legacy methods such as
UI::push() work as before.