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1d15a155f2
Fixes #631 - Adds --robots flag which will enable checking robots.txt for each host for each page, before the page is queued for further crawler. - Supports --robotsAgent flag which configures agent to check in robots.txt, in addition to '*'. Defaults to 'Browsertrix/1.x' - Robots.txt bodies are parsed and checked for page allow/disallow status using the https://github.com/samclarke/robots-parser library, which is the most active and well-maintained implementation I could find with TypeScript types. - Fetched robots.txt bodies are cached by their URL in Redis using an LRU, retaining last 100 robots entries, each upto 100K - Non-200 responses are treated as empty robots, and empty robots are treated as 'allow all' - Multiple request to same robots.txt are batched to perform only one fetch, waiting up to 10 seconds per fetch. --------- Co-authored-by: Ilya Kreymer <ikreymer@gmail.com> |
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