csp.fail

csp.fail is a live English-language website hosted on Cloudflare, Inc. (AS13335) in the United States, served by Cloudflare. cl0q first saw it on 2026-10-12 and last crawled it on 2026-10-19. It resolves to 104.21.43.185. Its favicon is fingerprinted by SHA-256, so you can find every other site that serves the same icon.

How the site describes itself:

CSP Fail — your CSP blocked something, here is why

Paste the CSP error your browser printed and get a plain-English explanation, the fix that does not gut your policy, and how to test it safely.