code: def use_soap(self, request, destination="", soap_headers=None, sign=False,
                   **kwargs):
          
          headers = [("content-type", "application/soap+xml")]
  
          soap_message = make_soap_enveloped_saml_thingy(request, soap_headers)
  
          logger.debug("SOAP message: %s", soap_message)
  
          if sign and self.sec:
              _signed = self.sec.sign_statement(soap_message,
                                                class_name=class_name(request),
                                                node_id=request.id)
              soap_message = _signed
  
          return {"url": destination, "method": "POST",
                  "data": soap_message, "headers": headers}
docs: Construct the necessary information for using SOAP+POST
  
          :param request:
          :param destination:
          :param soap_headers:
          :param sign:
          :return: dictionary