How to open a vaadin app with a GET request which contains JWT in Header

Hello guys,
I’m wanting to implement the following thing:

  1. User will be redirected to my vaadin app (with the url like myVaadinApp.com/app) from an external web site which will include a GET request which contains JWT in Header.
  2. Everytime it’ll open the vaadin app into a new window or tab so the init(VaadinRequest vaadinReq) method will be invoked each time. Now how can I get the request which will be sent from external web site while opening the app in the new tab at the same time?

Thanks in advance