<p>It doesn't work on my mac, even if I close Safari before, and even with <code>sudo</code>.</p>
<p>But it seem that the website coud disabled HSTS, for a particular website.<br>
The server must send this header:</p>
<div class="highlight highlight-text-html-php"><pre><span class="pl-s1"><span class="pl-c1">header</span>( <span class="pl-s"><span class="pl-pds">'</span>Strict-Transport-Security: max-age=0;<span class="pl-pds">'</span></span> );</span></pre></div>
<p>See:</p>
<ul>
<li><strong>max-age set to 0</strong> in <a href="https://www.scip.ch/en/?labs.20190214" rel="nofollow">HTTP strict transport security: five common mistakes and how to fix them</a></li>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security" rel="nofollow">HTTP Strict-Transport-Security</a></li>
</ul>

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