The "kein Filecode — Server gab leeren Link zurueck" error was treated as a
generic upload failure → after retries exhausted, the manager called mark-failed
and added the account to _failedAccounts → next batch re-primed with
primedFailed=1 → pre-job-swap-blocked because no fallback override exists for a
single-account hoster. One server-side flake permanently poisoned the session.
It's not an account problem — same account + same file works on a later try.
This is a doodstream-backend processing flake (empty CDN form, no fn / no st),
the same class as a transient network error: don't blacklist, just fail this
file cleanly.
- doodstream-upload.js: tag the empty-form throw with err.hosterTransient=true
(explicit flag, primary signal — matches the err.accountError / err.fileRejected
pattern already used elsewhere).
- upload-manager.js: new _isHosterTransientError classifier (flag first, message
regex as defensive fallback). In the retry loop: break on first hit (server
flake won't clear in 3 s, re-uploading the file 4× is pure bandwidth waste).
Post-loop: dedicated branch that emits the final error WITHOUT blacklisting
the account — same shape as the existing transient-network branch.
- Tests: classifier unit tests (flag path, regex path, negatives) + regression
test that proves the account is NOT added to _failedAccounts and mark-failed
does NOT fire. Drops the hoster-transient test from ~19 s to ~1.5 ms,
confirming the in-loop fast-break works.
We now fail fast on this error class instead of retrying — the next-batch
manual retry is the recovery path, and the account stays usable for it.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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