<ul>
<li><code>ipconfig getifaddr en0</code> -> <code>192.168.55.106</code></li>
<li><code>bin/rails server -b 0.0.0.0 -p 3000</code> -> Visit <code>http://192.168.55.106:3000/</code></li>
<li><code>lsof -i :3000</code> -> <code>localhost:hbci</code> vs <code>lsof -i :3000 -nP</code> -> <code>127.0.0.1:3000</code></li>
<li><code>localhost:3000</code> tries both IPv6 (<code>[::1]:3000</code>) and IPv4 (<code>127.0.0.1:3000</code>), look at <code>/etc/hosts/</code></li>
</ul>

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