There was a debug configuration attribute that was added in the 2017 r2 release of the web api to limit the information returned in a web client to reduce some security attack vectors. I am writing this from my phone but you should be able to find more information in the admin guide for the web api on livelibrary.
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Great advice and a big help at the office today. Thank you.
I would add that the "DebugMode" attribute is not present after upgrading to 2017 R2. Like other "System Configuration" entries it needs to be manually added. This is probably obvious to seasoned PI Web API admins... Also, once the attribute is there and set, changes will go into effect automatically and immediately. Good stuff!
Cheers, and kind regards,