postman测试获取预览链接接口报错：authorization mismatch

{ "code": 40100001, "msg": "sign check fail: authorization mismatch", "debug": {
"SignType": "WPS-4",
"appId": "******",
"appKey": "**********",
"contentType": "application/json",
"url": "/api/preview/v1/files/12345/link?type=w",
"method": "GET",
"body": "",
"date": "Mon, 05 Jan **** :: GMT"
}
}