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Non-working proxies could become alive again after some time. scrapy-rotating-proxies uses a randomized exponential backoff for these checks - first check happens soon, if it still fails then next check is delayed further, etc. Use ROTATING_PROXY_BACKOFF_BASE to adjust the initial delay (by default it is random, from 0 to 5 minutes). The randomized exponential backoff is capped by ROTATING_PROXY_BACKOFF_CAP.
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