It would be more useful if there was a way to see sites that actually were using the Cloudflare features that caused this bug. A large number of sites use Cloudflare, but few should have been affected by this bug:

> When the parser was used in combination with three Cloudflare features—e-mail obfuscation, server-side excludes, and Automatic HTTPS Rewrites—it caused Cloudflare edge servers to leak pseudo random memory contents into certain HTTP responses. https://arstechnica.com/security/2017/02/serious-cloudflare-...