<p>As it is written in this <a target="_blank" href="https://developer.chrome.com/blog/floc/">page</a>:</p>
<blockquote>
<p>A site should be able to declare that it does not want to be included in the user's list of sites for cohort calculation. A new interest-cohort permissions policy enables this. The policy will be allow by default.
A site can opt out of all FLoC cohort calculation by sending the HTTP response header:</p>
</blockquote>
<p><code>Permissions-Policy: interest-cohort=()</code></p>
<h4 id="apache">Apache</h4>
<p>In <code>/etc/apache/apache2.conf</code>:</p>
<p>After the line of loading all enabled module (make sure <code>headers.load</code> is added in <code>/etc/apache2/mods-enabled</code>), and before the line of loading sites-enabled, add:</p>
<pre><code class="lang-apache"><span class="hljs-section">&lt;IfModule mod_headers.c&gt;</span>
    <span class="hljs-attribute"><span class="hljs-nomarkup">Header</span></span> set Permissions-Policy <span class="hljs-string">"interest-cohort=()"</span>
<span class="hljs-section">&lt;/IfModule&gt;</span>
</code></pre>
<h4 id="nginx">Nginx</h4>
<p>Before the line of loading sites-enabled configure file:</p>
<p>In <code>/etc/nginx/nginx.conf</code></p>
<pre><code class="lang-nginx"><span class="hljs-attribute">add_header</span> Permissions-Policy <span class="hljs-string">"interest-cohort=()"</span>;
</code></pre>
<h2 id="reference">Reference:</h2>
<ul>
<li><a href="https://developer.chrome.com/blog/floc/" class="autolinkedURL autolinkedURL-url" target="_blank">developer.chrome.com/blog/floc</a></li>
</ul>


As it is written in this [page](https://developer.chrome.com/blog/floc/):

> A site should be able to declare that it does not want to be included in the user's list of sites for cohort calculation. A new interest-cohort permissions policy enables this. The policy will be allow by default.
> A site can opt out of all FLoC cohort calculation by sending the HTTP response header:

`Permissions-Policy: interest-cohort=()`

#### Apache

In `/etc/apache/apache2.conf`:

After the line of loading all enabled module (make sure `headers.load` is added in `/etc/apache2/mods-enabled`), and before the line of loading sites-enabled, add:

```apache
<IfModule mod_headers.c>
    Header set Permissions-Policy "interest-cohort=()"
</IfModule>
```

#### Nginx

Before the line of loading sites-enabled configure file:

In `/etc/nginx/nginx.conf`

```nginx
add_header Permissions-Policy "interest-cohort=()";
```

## Reference:

* https://developer.chrome.com/blog/floc/

0xBF

0xBF

HTTP Header: Set interest-cohort empty

Apache

Nginx

Reference: