Request refresh token update again
OAuth2 refresh token update can be performed only once.
* Because the previous refresh token becomes invalid immediately.
However, there are unfortunate cases where a network disconnection occurs and the client is unable to obtain the refresh token.
Therefore, we would like to change the behavior so that the refresh token update can be requested again only for a short time.
Also, please publish the ping endpoint to a third-party that can check the communication with the Box server. (Box Drive is already using)