Report errors in server processing

[silverpill]

@helge

In order to reduce their workload, the Moebius developers now propose the following:

• When submitting an ActivityPub object via POST, the Klein developers should include the header

POST: https://Moebius.band/inbox
X-Report-ActivityPub-Processing-Error: https://Klein.bottle/errorEndpoint

• If processing an object with this header results in an error, a report is send to this endpoint.

The Moebius server may also simply publish the error report via a well-known endpoint.

For example:

POST: https://moebius.band/inbox
X-ActivityPub-Request-Id: 123xyz

GET: https://moebius.band/.well-known/activitypub
{"errorReports": "https://moebius.band/errors"}

GET: https://moebius.band/errors?request_id=123xyz
{"errorMessage": "missing property 'attributedTo'"}

@helge

Is there any useful format for this type of error report? I could cook up something, but I would probably reinvent the wheel.

https://www.rfc-editor.org/rfc/rfc7807