OneWay 98ef99ab53 fix: probe source availability before showing download progress ...

Instant server failures (404/HTML error page) no longer flash a 0%
progress bar; the check mirrors the downloader's previous-day fallback
and tolerates transient network errors, which still go through the
downloader's retry path.

2026-09-05 10:03:54 +08:00

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research

fix: probe source availability before showing download progress

2026-09-05 10:03:54 +08:00