Common user + usage errors where better hints/descriptions should be supplied

[andrewxhill]

Response closed without headers => Connection to remote API failed

Unsupported encoding: 6 => this happens in at least one case, where a Secret is incorrectly copy/pasted or is the wrong string.

db required => lot's of places this happens. the obv suggestion is to use withThread to set the target db. partially confusing because it says db which a new user may not equate with the threadid. Another place this happens if you supply an incorrectly formatted threadid (e.g. just drop the first letter off)

many others, just caught these ones in testing this a.m.