docs: def get_raw_token(self, header):
          """
          Extracts an unvalidated JSON web token from the given "Authorization"
          header value.
          """
          parts = header.split()
  
          if len(parts) == 0:
              # Empty AUTHORIZATION header sent
              return None
  
          if parts[0] not in AUTH_HEADER_TYPE_BYTES:
              # Assume the header does not contain a JSON web token
              return None
  
          if len(parts) != 2:
              raise AuthenticationFailed(
                  _('Authorization header must contain two space-delimited values'),
                  code='bad_authorization_header',
              )
  
          return parts[1]