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This configuration essentially tells Scrapy that if a request for a page fails with any of the RETRY_HTTP_CODES, and for up to RETRY_TIMES per URL, then use a proxy from within the file specified by PROXY_LIST, and by using the pattern defined by PROXY_MODE. With this, you can have Scrapy fail back to any number of proxy servers to retry the request from a different IP address and/or port.

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