What an error page represents
Cloudflare can display an error page when a request is blocked, challenged or cannot reach the origin. Each error type has different causes and required template tokens.
Customisation
Plan support varies. A custom page should preserve required placeholders and must be tested without hiding diagnostic information needed by administrators.
Current Silurian scope
The dashboard reports available page types and state. Uploading or activating custom HTML is not enabled yet.
Official sources
This Silurian guide uses the following provider documentation as its technical source. Product availability still depends on the managed account and plan.
Cloudflare DevelopersCustom pages↗