New blog post: How to implement a basic ActivityPub server https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
@Gargron Very good idea. That was really missing ("Hello, world" in Activity Pub).
Exagone313 
@Exagone313
@bortzmeyer @Gargron More straight forward than https://www.w3.org/TR/social-web-protocols/
@Exagone313 @Gargron Indeed, this was the text that convinced me that this awful and complicated mess would never work