新增于: v8.4.0
该方法向响应添加 HTTP 尾部头(即消息末尾的头)。
【This method adds HTTP trailing headers (a header but at the end of the
message) to the response.】
尝试设置包含无效字符的头字段名称或值将导致抛出 TypeError。
【Attempting to set a header field name or value that contains invalid characters
will result in a TypeError being thrown.】