code: def verify_headers(self, check_presence=True, **kwargs):
          
          for key, val in kwargs.items():
              try:
                  _ok = self.verify_header(key, val)
              except KeyError:
                  if check_presence:
                      return False
                  else:
                      pass
              else:
                  if not _ok:
                      return False
          return True
docs: Check that a set of particular header claim are present and has
          specific values
  
          :param kwargs: The claim/value sets as a dictionary
          :return: True if the claim that appears in the header has the
              prescribed values. If a claim is not present in the header and
              check_presence is True then False is returned.