当我重定向用户时
https://www.facebook.com/dialog/oauth?
client_id=" + APP_ID +
&redirect_uri=" + CALLBACK_URL +
&scope=" + "read_mailbox" +
&state=" + java.util.UUID.randomUUID();
服务器收到错误
error_reason=user_denied
&error=access_denied
&error_description=The+user+denied+your+request.
&state=YOUR_STATE_VALUE
这种行为的原因是什么?