docs: def info_authn(self):
          """Check to see if user if authenticated for info.json.
  
          Must have Authorization header with value that has the form
          "Bearer TOKEN", where TOKEN is an appropriate and valid access
          token.
          """
          authz_header = request.headers.get('Authorization', '[none]')
          if (not authz_header.startswith('Bearer ')):
              return False
          token = authz_header[7:]
          return self.access_token_valid(
              token, "info_authn: Authorization header")