def METHOD_NAME(http_request_class):
    class ResponsePolicy(object):
        def on_request(self, *args):
            return
        def on_response(self, request, response):
            response.http_response.headers["x-ms-fun"] = "true"
    req0 = http_request_class("DELETE", "/container0/blob0")
    req1 = http_request_class("DELETE", "/container1/blob1")
    request = http_request_class("POST", "/multipart/request")
    request.set_multipart_mixed(req0, req1, policies=[ResponsePolicy()])
    return request