A data site owner discovered a significant issue impacting search engine visibility despite seemingly perfect technical checks. For two months, the site returned 200 OK responses on all URLs and displayed a valid sitemap, yet search engines indexed none of the pages. The root cause was a platform rewriting the robots.txt file, serving a default version that disallowed crawling, which bypassed standard verification checks.
This highlights a critical point for AI/ML/Data Science professionals: relying solely on superficial status codes can mask underlying issues hindering data accessibility and model training. A concrete implication is to routinely test critical files like robots.txt with query parameters to ensure crawlers are reading the intended version.
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