The mod update and Find Mods feeds feed the raw HTTP body straight to
Json.decode. When the endpoint hands back something that is not JSON
(an HTML error page, a proxy/captive prompt, or a plain-text outage
message like "Exceeded secondary rate limit" -- usually still HTTP 200),
the decoder's "unexpected character 'E'" assert escaped through the
pcall and became the error message, blaming the parser instead of the
response.
Add Json.describeUnexpected() as a pre-decode content-type guard: it
returns nil for body shapes the endpoints actually publish (JSON object
or array) and otherwise a short message naming what the server sent
(HTML page / plain text / empty, with a preview). Wire it into
ModUpdate.parseReleases and ModIndex.parse, so both the sync and async
update-check paths surface the real answer instead of the parse error.
HTTP status was already checked upstream by HostShell.httpGet (non-2xx
becomes "HTTP <code> from <url> (...)"); this closes the remaining
"2xx but not JSON" gap everywhere, including bridge platforms that
expose no status or headers.
Add regression tests for plain-text, HTML, and empty bodies; strengthen
the ModIndex HTML soft-fail test.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
A mod index can now publish three optional per-entry fields -- downloads
(total across every release), first_release and last_release (ISO days) --
which the FIND MODS listing shows in the same gold line the MODS tab uses.
The fields are additive by design: feeds that carry them stay readable by
every build that predates them (schema_version stays 1), and feeds that do
not render exactly as before. ModUpdate.statsLine builds the shared line;
the MODS tab reuses it. Parser, formatting, and parse coverage are tested.
bryanthaboi