parameters: (self)
docstring: The auth property used to identify the peer.
  
          For example, "x509_common_name" or "x509_subject_alternative_name" are
          used to identify an SSL peer.
  
          Returns:
            The auth property (string) that indicates the
            peer identity, or None if the call is not authenticated.
docstring_summary: The auth property used to identify the peer.
docstring_tokens: The auth property used to identify the peer .
function: def peer_identity_key(self):
          """The auth property used to identify the peer.
  
          For example, "x509_common_name" or "x509_subject_alternative_name" are
          used to identify an SSL peer.
  
          Returns:
            The auth property (string) that indicates the
            peer identity, or None if the call is not authenticated.
          """
          raise NotImplementedError()
function_tokens: def peer_identity_key ( self ) : raise NotImplementedError ( )