Glossary · Crawlers and access
uniform refusal
An origin answering the homepage and a path that cannot exist the same way: same status, same size, or the same challenge or block page. A site does not serve a missing page identically to its home page, so the answers describe a wall rather than the site. CrawlCheck records exactly one finding for such a scan and grades nothing; a score produced through a wall would be a number about someone else's product.
Terms this definition uses
Crawlers and access
Who is fetching, whether they are who they claim, and what your rules actually permit.
retrieval crawler · user-triggered fetch · verified crawler · forged crawler identity · unverifiable · robots.txt · user-agent group · AI opt-out · Content-Signal · crawl budget · cloaking · challenge page at 200 · nonexistent-path control · blocked render resource · off-host redirect · homepage refused · FCrDNS · Crawler trap · Conditional request · ASN blocking · operator feed · residential proxy · Google-Extended · Google-Agent · GPTBot vs OAI-SearchBot · ClaudeBot vs Claude-User · PerplexityBot vs Perplexity-User · CCBot · Bytespider · agentic traffic · crawler classification
← challenge page at 200 · nonexistent-path control →
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