challenge page at 200

A bot-protection interstitial returned with a success status. Any validator that trusts the status code records the file as present and readable when nothing readable was served.

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 · uniform refusal · 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

← cloaking · uniform refusal →

See it in the full glossary · 579 terms across 19 areas. Scan a site to see which of these apply to it.