Configuring behaviour per URL.
WHAT THEY DO
Apply settings to URLs matching a pattern: caching behaviour, security level, SSL, redirects.
WHAT PEOPLE USE THEM FOR
Bypassing cache for admin and checkout paths Caching HTML for specific sections Bypassing security for a validation path Redirecting one URL to another Disabling optimisation features for a path that breaks
THE ORDER MATTERS
Rules are evaluated in order, and the first match applies. Specific rules must come above general ones.
A general rule at the top prevents everything below it applying.
THE FREE PLAN LIMIT
A small number of page rules. Use them for what matters most.
Cloudflare's newer cache rules and redirect rules have separate allowances and are worth using instead where available.
THE RULES MOST SITES NEED
Bypass cache for the admin path Bypass cache for cart, checkout and account, on a shop Bypass security for anything that legitimately makes many requests
TESTING
After creating a rule, test the matching URL and a non-matching one. Patterns are easy to get slightly wrong.