@phiofx @notroot @darnell @badtux @DopeGhoti right - the problem is that people are diving into "ActivityPub for X" but perhaps they are working in isolation and the work doesn't feed back into common libraries/tools for that language.
Personally I tried building a simple AP implementation a year or so ago and gave up because of the overwhelming complexity (and I've dealt with complexity before e.g. SAML integration) and the lack of good testing tools.