Kintone will be updated on 6th October 2017.
A minor fix will be applied to Kintone's APIs.

Kintone REST API

Bug fixes

• When the Get Apps API is used on a Guest Space, and the Guest Space ID is not specified, the API returns an error stating "Illegal request".
  • Fix: The error message will become more friendly, stating to place the Guest Space ID in the request.