@startuml Request Flow

start
:User makes request;
  'Redirect To HTTPS middleware, always installed'
  partition RedirectToHTTPS {
    if (Redirect To HTTPS Enabled) then (yes)
      if (request is HTTP or X-Forwarded-Proto not HTTPS) then (yes)
        :Return redirect to HTTPS;
        stop
        else (no)
      endif
      else (no)
    endif
    :Pass to next server;
  }


  if (GCP HealthCheck Enabled) then (yes)
    'GCP HealthCheck middleware, optionally installed'
    partition GCPHealthCheck {
      if (Request path is /liveness_check) then (yes)
        :Return OK;
      stop
      else if (Request path is /readiness_check) then (yes)
        :Return OK;
      stop
      else if (Path is / and user agent is "GoogleHC/1.0") then (yes)
        :Return OK;
        stop
      else (no)
      endif
    }
  else (no)
  endif

stop

@enduml