@startuml
  work_page -> IM_SDK : getAuthCode
  IM_SDK -> IM_Server : getAuthCode
  IM_Server --> IM_SDK : response
  IM_SDK --> work_page : response
  work_page -> open_server : login
  open_server -> IM_Server : verifyAuthCode
  IM_Server --> open_server : success
  open_server --> work_page : login success
  open_server <-> work_page : getApplications/favApplication etc.
@enduml