Robots.txt and Crawl Access: Making Sure Crawlers Can Reach You

Before a search engine can evaluate a page it has to fetch it. Crawl access is that first request, and it depends on 3 things agreeing: robots.txt permits the path, the server returns real HTML, and no protection layer intercepts the request on the way. Bot protection is the fastest-growing source of accidental blocking. A firewall rule tuned against scrapers regularly catches Googlebot, Bingbot and the AI crawlers alongside them. The site is perfectly usable in a browser while the crawler receives a challenge page, a 403, or a JavaScript interstitial. Because the response is technically successful, uptime monitoring stays green. Soft 404s cause the mirror-image problem: the server returns 200 alongside a page saying the content is missing, so search engines store an error state as content and the real page stops being crawled. Robots.txt itself deserves care. A single site-wide Disallow left over from a staging environment removes an entire domain from search. The file is fetched constantly and cached briefly, so a mistake spreads within hours and a fix propagates just as fast. Test access the way an external crawler would, with no cookies, no warm cache and no signed-in session, because that is the request search engines actually make.

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