App to User Requests can be used to re-engage a user in your app and can only be sent to users that have installed the app. For example, notifying a user that something has changed since their last visit, "10 of your friends are now online".
App to User Request are sent via the Graph API, for more information see the apprequests docs. App to User Requests are only available for Canvas apps, not websites, as accepting a request will direct the user to the Canvas Page URL of the app that sent the Request. Notifying Users of a App Request
App to User Requests do not create notifications, though they do appear in the App and Games Dashboard and increment an app bookmark counter, similar to User to User Requests. Accepting an App Request
This process is identical to accepting a User to User Request.
You can post a apprequest for a user by issuing an HTTP POST request to /USER_ID/apprequests with the app access_token.
Note: POSTing to the Graph API endpoint of /USER_ID/apprequests is considered an App to User Request. App-Generated Requests do not receive notifications and get limited distribution in comparison to User to User Requests sent with the Request Dialog
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我不认为应用程序到用户的请求会给你带来你想要的东西。因为它们只能发送给当前的应用程序用户。
来自：https://developers.facebook.com/docs/requests/
来自 https://developers.facebook.com/docs/reference/api/用户/#apprequests
I don't think app-to-user requests are going to get you what you want. As they can only be sent to current app users.
From: https://developers.facebook.com/docs/requests/
From https://developers.facebook.com/docs/reference/api/user/#apprequests