What the __cflb cookie does
When enabling session affinity with Cloudflare Load Balancer, Cloudflare sets a __cflb cookie with a unique value on the first response to the requesting client. Cloudflare routes future requests to the same origin, optimizing network resource usage. In the event of a failover, Cloudflare sets a new __cflb cookie to direct future requests to the failover pool.
Who sets it
Consent category: functional
Functional cookies remember a choice the visitor made, such as a language, a region or a layout preference. They are not essential, so visitors in the EU must be able to decline them, and a site should not set them before consent.
| Name | __cflb |
|---|---|
| Category | Functional |
| Lifetime | session |
| Set by | Cloudflare |
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From the Conzent cookie database, last updated 2026-09-27. Descriptions come from vendor documentation, cookie policies and our own scans; write to support@getconzent.com to correct one.