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Colly - Fast and Elegant Scraping Framework for Gophers.
With Colly you can easily extract structured data from websites, which can be used for a wide range of applications, like data mining, data processing or archiving.
Fast (>1k request/sec on a single core)
Manages request delays and maximum concurrency per domain
Automatic cookie and session handling
Automatic encoding of non-unicode responses
Google App Engine support