bodyParser caught parse failures and did nothing — the throw was commented out
and `body` was never set, so handlers destructured undefined and the client got
a 500 for a malformed request. Throw BAD_REQUEST instead.
Also adds the regression tests for the Host suffix match fixed in 2ca850c.
Verified against a running server: malformed JSON now 400, valid credentials
path still 401, spoofed Host still 403.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhas