edge cache pinning
A cached response continuing to be served after the origin has changed.
What edge cache pinning does not show
A purge API returning 200 is a statement about the API call, not evidence that anything was evicted.
How CrawlCheck measures edge cache pinning
2 finding codes measure it. Each one’s share of all scans is computed from the live corpus when this page is served, not typed into it.
| Finding code | Share of scans | Guide |
|---|---|---|
CHALLENGE_PINNED_AT_EDGE | 0.4% | Is Cloudflare blocking AI crawlers on your site? What changes on 15 September 2026 |
MACHINE_FILE_CACHE_SPLIT | 0.1% | Does llms.txt actually do anything? |
Every code, its rule and its current rate: the dataset page. Scan a site to see which apply to it.
Where edge cache pinning comes up on this site
- robots.txt returned 200 and no crawler could read it: challenge pagesThe purge that returned 200 and evicted nothing and a cache rule does not evict what is already cached are the two follow-ups; the glossary defines challenge page at 200 and edge cache pinning .
Related terms in Delivery and rendering
What arrives on the wire, and what only exists after something else runs.
payload ratio · render dependence · render dependence gap · TTFB · Core Web Vitals · CrUX · field data · prompt injection · Hydration mismatch · Dynamic rendering · DOM depth · Edge transformation · 202 interstitial · rate limiting · bot management platform
Questions about edge cache pinning
What is edge cache pinning?
A cached response continuing to be served after the origin has changed.
What does edge cache pinning not show or guarantee?
A purge API returning 200 is a statement about the API call, not evidence that anything was evicted.
How does CrawlCheck measure edge cache pinning?
Through the finding codes CHALLENGE_PINNED_AT_EDGE, MACHINE_FILE_CACHE_SPLIT, each with a stated rule, evidence bytes and a live share of scans on the dataset page.
Which area of the glossary does edge cache pinning belong to?
Delivery and rendering: What arrives on the wire, and what only exists after something else runs.
← render dependence gap · TTFB →
See it in the full glossary · 731 terms across 19 areas.