getService, getLayer should automatically retry failed requests sans authentication

Background

ArcGIS Server tries to validate any token passed in a request whether or not authentication is needed for that request. This can lead to a scenario such as the following:

Bob creates a Feature Service item on ArcGIS Enterprise for a public feature service on AGOL. The consuming application sends an ArcGIS Enterprise authentication token in requests to the AGOL service. The service tries to validate the token with AGOL and fails, preventing the request from succeeding. If a token is not sent, the request is successful since the service is public.

Solution

A simple and bullet-proof approach to solving this would be to

• Make the request with authentication
• If it fails with an ArcGIS Auth Error, make it again without authentication

cc @rgwozdz @tomwayson

[andrewctate]

@rgwozdz was under the same impression. The most we could find was the retry method on the ArcGISAuthError class which is helpful, but doesn’t get us all the way there.

Simply put, when I call getService and provide authentication it does not automatically try it without authentication.

[patrickarlt]

@tomwayson @gavinr @jwasilgeo and I met on this. We can’t decide on the best way forward. There isn’t a good consensus on HOW we should resolve this issue since it is complex and the auth flow is already rather complex.