request.authority

• 类型：<string>

请求的 authority 伪头字段。由于 HTTP/2 允许请求设置 :authority 或 host，如果存在 req.headers[':authority']，则该值从其派生。否则，它从 req.headers['host'] 派生。

【The request authority pseudo header field. Because HTTP/2 allows requests to set either :authority or host, this value is derived from req.headers[':authority'] if present. Otherwise, it is derived from req.headers['host'].】