Page Rules trigger certain actions whenever a request matches one of the URL patterns you define. You can define a page rule to trigger one or more actions whenever a certain URL pattern is matched. Refer to the Page Rules to learn more about configuring Page Rules.
Cloudflare acts as a reverse proxyOpen external link to provide services, like Page Rules, to Internet properties. Your application’s traffic will pass through a Cloudflare data center that is closest to the visitor. There are hundreds of these around the world, each of which are capable of running services like Workers and Page Rules. If your application is built on Workers and/or Pages, the Cloudflare global networkOpen external link acts as your origin server and responds to requests directly from the Cloudflare global network.
When using Page Rules with Workers, the following workflow is applied.
Request arrives at Cloudflare data center.
Cloudflare decides if this request is a Worker route. Because this is a Worker route, Cloudflare evaluates and disabled a number of features, including some that would be set by Page Rules.
Page Rules run as part of normal request processing with some features now disabled.
Worker makes a same-zone or other-zone subrequest. Because this is a Worker route, Cloudflare disables a number of features, including some that would be set by Page Rules.
Page Rules are evaluated both at the client-to-Worker request stage (step 2) and the Worker subrequest stage (step 5).
If you are experiencing Page Rule errors when running Workers, contact your Cloudflare account team or Cloudflare Support.