code: def _send_response(
          self, environ, start_response, root_res, success_code, error_list
      ):
          
          assert success_code in (HTTP_CREATED, HTTP_NO_CONTENT, HTTP_OK)
          if not error_list:
              # Status OK
              return util.send_status_response(environ, start_response, success_code)
          if len(error_list) == 1 and error_list[0][0] == root_res.get_href():
              # Only one error that occurred on the root resource
              return util.send_status_response(environ, start_response, error_list[0][1])
  
          # Multiple errors, or error on one single child
          multistatusEL = xml_tools.make_multistatus_el()
  
          for refurl, e in error_list:
              # assert refurl.startswith("http:")
              assert refurl.startswith("/")
              assert isinstance(e, DAVError)
              responseEL = etree.SubElement(multistatusEL, "{DAV:}response")
              etree.SubElement(responseEL, "{DAV:}href").text = refurl
              etree.SubElement(responseEL, "{DAV:}status").text = "HTTP/1.1 {}".format(
                  get_http_status_string(e)
              )
  
          return util.send_multi_status_response(environ, start_response, multistatusEL)
docs: Send WSGI response (single or multistatus).
  
          - If error_list is None or [], then <success_code> is send as response.
          - If error_list contains a single error with a URL that matches root_res,
            then this error is returned.
          - If error_list contains more than one error, then '207 Multi-Status' is
            returned.