下载语音/图片文件,保存到本地服务器，生成的图片打不开

返回的数据中是否不应该有这段头部信息：HTTP/1.1 200 OK Server: Tengine/2.0.3 Date: Mon, 31 Oct 2016 08:04:36 GMT Content-Type: application/octet-stream;charset=UTF-8 Content-Length: 61451 Connection: keep-alive Access-Control-Allow-Origin: * Set-Cookie: rememberMe=deleteMe; Path=/; Max-Age=0; Expires=Sun, 30-Oct-2016 08:04:36 GMT Content-Disposition: attachment;