http_error.py 文件源码

def __call__(self, environ, start_response):
        for err_str in self.app_iter:
            err = {}
            try:
                err = json.loads(err_str.decode('utf-8'))
            except ValueError:
                pass

            links = {'rel': 'help', 'href': 'https://developer.openstack.org'
                     '/api-guide/compute/microversions.html'}

            err['max_version'] = self.max_version
            err['min_version'] = self.min_version
            err['code'] = "zun.microversion-unsupported"
            err['links'] = [links]
            err['title'] = "Requested microversion is unsupported"

        self.app_iter = [six.b(json.dump_as_bytes(err))]
        self.headers['Content-Length'] = str(len(self.app_iter[0]))

        return super(HTTPNotAcceptableAPIVersion, self).__call__(
            environ, start_response)