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CaliBrain
12d554a92f
503 is in RETRYABLE_CODES, and the bypasser is only ever reached from the 403 branch and the AA redirect-loop rescues. Once Z-Library re-serves its DDoS-Guard interstitial with the same cookie the #1188 handshake already echoed back, the request has nothing left to try and spends every attempt on the same wall. Gate the handoff on the response body rather than the status, so a genuine overloaded-origin 503 keeps its retry path, and on allow_bypasser_fallback, so best-effort fetches still fail fast. The challenge indicators move out of internal_bypasser into shelfmark/bypass/challenge.py so http.py can use them without importing SeleniumBase, which is lazily imported precisely because it is optional. Refs #1233