Classify common scraper failure modes so the right controls can be added before launch.
Place each failure mode in the bucket where its main effect appears first. Access failure Extraction failure Data quality failure Operational failure robots.txt disallows the requested crawl path HTTP 403 appears on a source path that worked in the pilot The price selector returns no element after a markup change The parser reads review count as price because a badge moved The same product appears through three category URLs Rows do not show whether content was observed today or only checked today Pagination keeps re-queuing page 1 through recommendation links Concurrency triggers repeated 429 responses across the host Request logs…
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