Observed Signal · Aug 6, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Unique click ID via Cloudflare Single Redirect
The article demonstrates a technique to append a unique click identifier to redirect targets using Cloudflare's Single Redirect rules on the free plan, without running a Worker. The approach reuses cf.ray_id (the Cloudflare ray ID) in the redirect target expression to produce a per-request click_id that matches the CF-RAY response header. The author documents measured behavior, caveats and traps: uuidv4() and cf.random_seed are forbidden in redirect targets; preserve_query_string replaces the target query rather than merging; 301 permanent redirects can cause browsers to replay cached redirects and reuse old IDs; and the redirect action cannot record clicks on Cloudflare's side because it terminates the request before analytics can see it. The piece lists rule quotas per plan and when this pattern is or is not sufficient for attribution.
Provides a practical, technical method for click-level tracking using Cloudflare redirects without Workers; useful to practitioners but niche and not industry-shifting.
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Key Takeaways & Evidence Grounding
- Cloudflare redirect expressions can substitute cf.ray_id into a redirect target, producing a click_id identical to the CF-RAY response header.
- uuidv4() and cf.random_seed are blocked in redirect targets; the validator returns an error preventing their use.
- preserve_query_string on Single Redirects replaces the target query entirely rather than merging incoming and target queries, which can remove constructed click_id values.
- Permanent 301 redirects may be cached by browsers (no Cache-Control header), causing cached replays of an old click_id; use 302 or 307 to avoid that.
- Single Redirect rule quotas (checked 2026-07-30): Free=10 per zone, Pro=25, Business=50, Enterprise=300.
Connected Companies & Entities
1 Entity mapped“What it can do is reuse an identifier Cloudflare has already minted for the request: cf.ray_id, the ray ID that every request through Cloudf...”
Ontology Mapping & Concepts
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