微信小店客服消息事件图片链接打不开

接口文档地址：https://developers.weixin.qq.com/doc/store/shop/notify/kf_callback/kf_msg_event.html

回调地址监听到的消息入参如下，image.cos_url字段值，下载下来的图片文件无后缀、打不开

{
	"ToUserName": "gh_4566a34b8ded",
	"FromUserName": "okZYK2Xv2MB-KuPYDVuLzO1TtzoY",
	"CreateTime": 1781508455,
	"MsgType": "event",
	"Event": "commkf_send_msg_to_kf",
	"msg_id": "4562007792698998792",
	"msg_type": "image",
	"msg_event": "EVENT_TYPE_SEND_MSG",
	"image": {
		"cos_url": "https://channels.weixin.qq.com/shop/commkf/downloadmedia?encrypted_param=AATnc0cFAAABAAAAAAA5uY9Aj7GqUEYKZqkvaiAAAABVxWnrPHpeHkV0eOfm15cAE2ZlRiWJZOeqotoS5BgYsjiW3ub36uUJ_HX-9ZHUIN6_5-9vxQRdA0uii0m2g_y_774ALA-ct6voVh6kDjgWK8ROdNS8K_3nilyQ6FnPdsbc1_p-lUsaAr0jtYWPlSaMrTa9Y-j-EjH36eBS5Mn3Y39dDcbxuhP2Jmqk4Tl_bTNYWBK-HLcJ3LUEd2fCwHDaYp-rFDyVDg818fA3sZpGAiXTe6AdIbR9-rN4Ako1Hi8W33xLHtToRBQiKVghuOacHYgXwrYh_Vm0gJYTMsdQtBbHDffyJlZZWPGN89bKqfwy5nVbvTJw0YBidelBjL25NbneLnk9bEYPAjyTVpjsxNzACyc3Zzo-WeuExJiDBj-GMoMpDusTjcp_zQoilPSnlGCqtoNZZhWvDCA0hpLSBJyerueVbL6EPQoKfMIv&timestamp=1782718054&openid=okZYK2Xv2MB-KuPYDVuLzO1TtzoY&msg_type=2"
	},
	"is_night_msg": 0,
	"union_id": ""
}