Steps to reproduce the problem

1. Read the blog article at https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
2. Try to send a POST request to a Mastodon instance.

Expected behaviour

The POST request should be accepted by the server (code 202)

Actual behaviour

The server answers an error 401

Specifications

The blog post is missing the information about the Digest field.

See