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Scrapy Web Development

Avoiding getting banned crawling web

  • rotate your user agent from a pool of well-known ones from browsers (google around to get a list of them)
  • disable cookies as some sites may use cookies to spot bot behaviour
  • use download delays (2 or higher).
  • if possible, use Google cache to fetch pages, instead of hitting the sites directly
  • use a pool of rotating IPs. For example, the free Tor project or paid services like ProxyMesh. An open source alternative is scrapoxy, a super proxy that you can attach your own proxies to.
  • use a highly distributed downloader that circumvents bans internally, so you can just focus on parsing clean pages.

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