consul/ui/packages/consul-ui/app/components/app-error/index.hbs

<AppView>
  <BlockSlot @name="header">
    <h1>
      Error {{@error.status}}
    </h1>
  </BlockSlot>
  <BlockSlot @name="content">
    <ErrorState @error={{@error}} @allowLogin={{eq @error.status "403"}} />
  </BlockSlot>
</AppView>