[keycloak-user] Access Token And PRT(request party token), which one should I use to access the resource protected by keycloak

Hi, By reading the document of KeyCloak ,I found that I can use a Access-token or a PRT(request party token) to access the resources protected by keycloak. 1 Use PRT: https://keycloak.gitbooks.io/documentation/authorization_services/topics/... GET /my-resource-server/my-protected-resource HTTP/1.1 Host: host.com Authorization: Bearer ${RPT} 2 Use access token: https://github.com/keycloak/keycloak-quickstarts/blob/master/app-jee-html... line 38 if (keycloak.authenticated) { req.setRequestHeader('Authorization', 'Bearer ' + keycloak.token); } I'm confused about the difference between them. I don't know When I should use access token , and when I should use another one ? I am looking forward to your reply. thanks , yizhou