Resolve Gateway Rule IDs Before Showing Them

A Gateway rule UUID is good correlation data but poor user-facing information.

When my custom block-page Worker receives cf_rule_id, I use it to retrieve the rule object and display the configured rule name.

The flow is:

cf_rule_id
   ↓
Gateway rules API
   ↓
configured rule name
   ↓
block page

If the API lookup succeeds, support gets a meaningful value such as:

Block Newly Registered Domains

If it fails, the Worker falls back to the original rule ID rather than failing the block page.

I also cache successful rule-name lookups briefly. Rule names change far less frequently than block events, so resolving the same ID for every request would add unnecessary API traffic.

Related: Building a Better Cloudflare Gateway Block Page.