docs: def build_swagger_12_api_declaration_view(api_declaration_json):
      """Thanks to the magic of closures, this means we gracefully return JSON
      without file IO at request time.
      """
      def view_for_api_declaration(request):
          # Note that we rewrite basePath to always point at this server's root.
          return dict(
              api_declaration_json,
              basePath=str(request.application_url),
          )
      return view_for_api_declaration