@startuml
'https://plantuml.com/sequence-diagram

actor Client
boundary "App-Website" as AppUI
control "App-Rest-API" as AppAPI

Client -> AppUI : Anfrage an Webseite
AppUI -> AppAPI : Anfrage an Webseite
Client --> AppUI : //Web-Token//
AppUI --> AppAPI : //Web-Token//
AppAPI -> AppAPI : //Web-Token// überprüfen
alt //Web-Token// ist gültig
    AppAPI -> AppAPI : Client-Rolle überprüfen
    alt Rolle ist gültig
        AppAPI -> AppAPI : Anfrage auswerten
        AppUI <-- AppAPI :
        Client <-- AppUI :
    else
        AppUI <- AppAPI : HTTP-Code 403
        Client <- AppUI : HTTP-Code 403
    end
else
    AppUI <- AppAPI : HTTP-Code 401
    Client <- AppUI : HTTP-Code 401
end

@enduml