fix: in non-HTTP server, added missing content-type headers for HTML error body responses, and disabled fallback filesystem path (potentially absolute) to av oid security issues (was useful for some sourcemap edge cases)
fix: in non-HTTP server, added missing content-type headers for HTML error body responses, and disabled fallback filesystem path (potentially absolute) to av
oid security issues (was useful for some sourcemap edge cases)

daisy/ace,daisy/ace,daisy/ace