SampleServer6: Deliberately return errors for testing purposes

[Bud]

SampleServer6 is a handy testing tool when developing GIS integrations.

Example: https://sampleserver6.arcgisonline.com/arcgis/rest/services/ServiceRequest/MapServer/1/query?where=1...

I wonder if ESRI could consider the following:

• Set up a few dummy pages/URLs that deliberately return error text. For errors like ERROR 400, 401, 403, 404, 500
• As a novice, I was able to fake an ERROR 400 by putting a random 'x' in the URL:
  https://sampleserver6.arcgisonline.com/arcgis/rest/services/ServiceRequest/xMapServer/1/query?where=...
  But I don't know how I would test for other errors/scenarios.

If we had some sample map service layers that returned errors...then that would be helpful for testing purposes when developing GIS integrations.

Thanks.