How to Block FLoC using Nginx, Apache, WordPress, HAProxy and more?

FLoC or Federated Studying of Cohorts is a current rollout from Google to interchange third-party cookies with their very own built-in consumer monitoring browser.

That is basically a built-in Chrome browser itself, and folks involved about privateness can change to a different browser involved about privateness to keep away from being tracked. However web site house owners may decide out of FLoC by making some easy adjustments to their net server’s HTTP response header.

I counsel trying out this Google and GitHub web page for extra data on FLoC.

On this article, we’ll focus on methods through which you as an internet site proprietor can decide out of FLoC by means of easy configuration adjustments in net servers.

Customized HTTP header

A customized HTTP response header causes the web site proprietor to decide out of FLoC. The response header for that is:

Permissions-Coverage: interest-cohort=()

Let’s check out the implementation.


For NGINX it’s essential add add_header directive inside every server block (if a single configuration file is used for a number of web sites) or to every respective server configuration file.

server {
    location / {
      add_header Permissions-Coverage interest-cohort=();

After which restart the NGINX service:

systemctl restart nginx

differentyou’ll be able to take a unique method by including the under to the http block.

add_header Permissions-Coverage "interest-cohort=()";

It seems like this in HTTP response headers.

HTTP/1.1 200 OK
Server: nginx/1.14.1
Date: Fri, 30 Apr 2021 06:37:02 GMT
Content material-Kind: textual content/html
Content material-Size: 4057
Final-Modified: Mon, 07 Oct 2019 21:16:24 GMT
Connection: keep-alive
ETag: "5d9bab28-fd9"
Permissions-Coverage: interest-cohort=()
Settle for-Ranges: bytes


For Apache net server, add the customized header to your configuration file as:

<IfModule mod_headers.c>
  Header all the time set Permissions-Coverage: interest-cohort=()

Then restart Apache to make it efficient:

systemctl restart httpd

Which could have an output like under.

HTTP/1.1 200 OK
Date: Fri, 30 Apr 2021 06:49:58 GMT
Server: Apache/2.4.37 (centos)
Permissions-Coverage: interest-cohort=()
Final-Modified: Thu, 29 Apr 2021 06:40:41 GMT
ETag: "3-5c116c620a6f1"
Settle for-Ranges: bytes
Content material-Size: 3
Preserve-Alive: timeout=5, max=100
Connection: Preserve-Alive
Content material-Kind: textual content/html; charset=UTF-8


In case your WordPress is shared internet hosting, you’ll not have the choice to edit the online server configuration file. However excellent news is that you may set headers within the codebase through hooks. In your energetic themes operate.phpadd the next strains on the finish:

	operate ( $headers ) {
		if ( empty( $headers['Permissions-Policy'] ) ) {
			$headers['Permissions-Policy'] = 'interest-cohort=()';
		} elseif (
			! empty( $headers['Permissions-Policy'] )
			&& false === strpos( $headers['Permissions-Policy'], 'interest-cohort' )
		) {
			$headers['Permissions-Policy'] .= ', interest-cohort=()';

		return $headers;

Save the file within the WordPress admin backend and the header needs to be pushed in all new requests. Make sure that to clear the cache within the mechanism/plugin for the brand new header to take impact.

This is what my deployment output seems like.

cache-control: no-cache, must-revalidate, max-age=0
content-encoding: br
content-type: textual content/html; charset=UTF-8
date: Fri, 30 Apr 2021 13:40:14 GMT
expires: Wed, 11 Jan 1984 05:00:00 GMT
host-header: 6b7412fb82ca5edfd0917e3957f05d89
hyperlink: <>; rel=""
permissions-policy: interest-cohort=()
server: nginx
set-cookie: wpSGCacheBypass=1; expires=Fri, 30-Apr-2021 15:20:14 GMT; Max-Age=6000; path=/; HttpOnly; SameSite=Lax
differ: Settle for-Encoding
x-cache-enabled: True
x-httpd: 1
x-proxy-cache: BYPASS
x-proxy-cache-info: 0 NC:100000 UP:SKIP_CACHE_SET_COOKIE

One other A easy answer can be to make use of the HTTP Headers plugin.


HAProxy permits including the header directive to its configuration. In frontend, pay attention or backend part of the configuration (whichever is relevant), add the next directive:

http-response set-header Permissions-Coverage interest-cohort=()

Be sure you restart your HAProxy server if:

systemctl restart haproxy

This makes the header efficient for all new requests.


Usually used as an ingress controller for the container atmosphere, Traefik will be configured to decide out of FLoC, much like the servers above. In your traefik.toml file, add the next strains:

        Permissions-Coverage = "interest-cohort=()"

Or for YAML based mostly configuration (traefik.yml) utilization:

          Permissions-Coverage: "interest-cohort=()"

Or in case you are utilizing Traefik with Docker, change the traefik label to docker-compose.yml if:

  - "traefik.http.middlewares.floc.headers.customresponseheaders.Permissions-Coverage=interest-cohort=()"


FLoC is a brand new oversight mechanism and if you don’t want to serve interest-based adverts in your web site, you’ll be able to decide out by implementing the permissions coverage headers as defined above. As a consumer, you’ll be able to view this particular web page (Am I FloCed?) to see in case you are being tracked with FLoC.

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