<p>Sounds like a bug in Safari to me - the <code>worker-src</code> directive (<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/worker-src" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/worker-src</a>) specifies valid sources for Worker, SharedWorker, or ServiceWorker scripts and as we don't use any of those we set it to <code>none</code>.</p>
<p>I have no idea why Safari has decided to apply it to an iframe load - we do add <code>http://127.0.0.1:8111</code> to both <code>frame-src</code> and <code>child_src</code> in our security policy which is the policy that should be used for such loads (<code>frame-src</code> is a newer replacement for <code>child-src</code>).</p>

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