Overview
Cloudflare Custom Error Page Crawler is a crawler operated by Cloudflare to fetch customer error pages for edge delivery or caching.
Its primary user-agent pattern is Collapsify/; related patterns include Collapsify; Cloudflare Collapsify; Custom Error Page Crawler.
Cloudflare Custom Error Page Crawler is Unverified at the identity-evidence level. The listed identity remains useful for detection, but this record does not currently contain authoritative evidence sufficient to authenticate the identity claim.
Robots.txt behavior is not currently confirmed.
Cloudflare Custom Error Page Crawler should be reviewed against site policy, source evidence, crawl rate, and requested paths before a permanent allow or block rule is created.
Identity
- User-Agent Pattern
-
Collapsify/ - Aliases
- Collapsify; Cloudflare Collapsify; Custom Error Page Crawler
- HTTP Agent Examples
-
Collapsify/ - Robots Token
- Collapsify/
- Identity Type
- Observed
- Evidence Method
- Treat `Collapsify/` as an identity signal only. Confirm it with current operator documentation, cryptographic verification, forward-confirmed reverse DNS, source-network ownership, or other authoritative evidence before trusting the claimed identity.
Classification
- Type
- Crawler
- Kind
- Crawler
- Family
- Cloudflare
- Purpose
- Error page caching
Behavior and handling
- Common Use
- Fetches customer error pages so they can be served or cached at the edge when needed.
- Detection Notes
- Cloudflare Custom Error Page Crawler traffic is primarily detected by the `Collapsify/` user-agent pattern; related patterns include `Collapsify; Cloudflare Collapsify; Custom Error Page Crawler`. Compare source IPs, reverse DNS, request paths, and crawl cadence with Cloudflare infrastructure before trusting the traffic.
- Respects robots.txt
- Unknown
- Spoofing Risk
- Cloudflare Custom Error Page Crawler has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.
- Risk
- Neutral
- Recommended Handling
- Depends
Rules and controls
- Robots.txt Snippet
-
# robots.txt behavior is unconfirmed. Do not rely on this rule without verification.
Relationships
- Operator
- Cloudflare Checked 2026-08-07
Relationships without an Evidence link are normalized from the canonical directory record. They should not be interpreted as independent proof of physical presence or request origin.