- fetchIpv4 builds its Response inside the https response callback, outside
the promise. A 204, 205 or 304, a status above 599 or an invalid reason
phrase made the Response constructor throw there, an uncaught exception
that stops the dev server. Null-body statuses now get a null body and
anything else that cannot become a Response rejects, as the Radio Browser
transport does.
- A non-OK FIRMS or mapkey-status response cancels its body so the IPv4
socket closes at once instead of at the deadline.
- Tests: the crash cases (fail on the old code), a source check that every
upstream request goes through fetchFirms and that fetchSource's body read
shares its deadline (fails if either call reverts to fetch), a real-fetch
contract test for the address-selection error shape, and an explicit skip
in the IPv4-only socket test where the host cannot tell the families apart.
- Changelog entry moves to changelog.d/1078-firms-ipv4-fallback.md per
CONTRIBUTING; CURRENT-STATE says which timeouts are retried and that the
retry does not follow redirects.
