OpenData expects all data to be freely accessible, but there are times that we would like to allow for a query/filtered download access to our secure AGS services.
Although, I admit I am still confused by the proxy process, after much research and support tickets, I see this as being able to happen if AGOL and Opendata could be called/referenced as part of the GitHub - Esri/resource-proxy: Proxy files for DotNet, Java and PHP. with the "allowedReferers" and if there was a way to create a "ProxyRule" for a AGOL/OpenData when adding an AGS Web Service, rather than trying to store credentials with the service.
This may be an overly simplified solution, but bottom line, I would like to allow controlled access to secure AGS services without a user login, using the proxy file on our AGS/IIS server (.net).
Just to add other ideas that are related, but not quite the same: