title: JWT why we need Bearer word?
body: <p>I have seen many example with JWT, and all of them have word <code>Bearer</code>.
  I have build an auth service on <code>spring(Java)</code> with <code>com.auth0.java-jwt</code> version <code>3.2.0</code>, and what i'm doing when i'm getting <code>Authentication header</code> from request, that i'm calling <code>requestHeader.substring(7)</code> because this JWT lib needs only token, it don't use this <code>Bearer</code>. So why is this <code>Bearer</code> needed in general?)</p>