Detail backfill (run 217) hit 5 consecutive HTTP 429s and aborted at 19 enriched because the detail fetcher only had a same-session 429 short-retry (no reconnect). 429s are persistent: keep-alive reuses one backconnect exit IP across sequential detail fetches -> avito rate-limits it. Mirror the merged SERP 429 fix (#1769): widen short-retry 4->8 and add up to 3 ephemeral-session reconnects (fresh exit IP) on 429 exhaustion before raising. Caller session never touched (as with 403 path). |
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