Functional

"__cflb" Cookie

Cloudflare

Description

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.

Details

Cookie Name: __cflb
Category: Functional
Service: Cloudflare
Duration: session
Popularity: 0.7% of scanned websites
Data Source: Open cookie db

Consent Requirement

This cookie is classified as functional. Under GDPR and similar regulations, explicit consent is recommended before setting this cookie.

Consent Requirements by Regulation

GDPR & ePrivacy (EU)

Consent is recommended before setting __cflb. Functional cookies are only exempt when strictly necessary for a feature the visitor explicitly requested, such as remembering a language choice they just made.

UK GDPR & PECR

Same position as the EU rules: obtain consent unless the cookie qualifies for the strictly necessary exemption.

CCPA/CPRA (California)

Disclose __cflb in your privacy policy. If the stored data is shared with third parties, opt-out requests, including the Global Privacy Control signal, must be honoured.

Managing __cflb with a Consent Banner

A consent management platform keeps __cflb blocked until the visitor opts in to the functional category. Kukie.io's scanner detects it automatically, categorises it, and the banner's auto-blocking holds back the script that sets it until consent is given - visitors who decline never receive it.

Frequently Asked Questions

Does the __cflb cookie require consent?

Usually yes. __cflb is a functional cookie, and unless it is strictly necessary for a feature the visitor explicitly requested, you should obtain consent before setting it.

How long does the __cflb cookie last?

__cflb typically persists for session. The exact lifetime can vary with the site's configuration and the version of the script that sets it.

Who sets the __cflb cookie?

__cflb is set by Cloudflare. It is categorised as functional.

How common is the __cflb cookie?

__cflb appears on about 0.7% of the websites scanned by Kukie.io, based on real scan data.

How do I block or delete the __cflb cookie?

Visitors can delete __cflb at any time through their browser's cookie settings. Site owners can keep it blocked until consent with a consent management platform: Kukie.io's auto-blocking holds functional cookies back until the visitor opts in.