title: webpack-dev-server open and host opens wrong URL
body: <p>Per the docs <a href="https://webpack.js.org/configuration/dev-server/#devserver-open" rel="nofollow noreferrer">here</a> and <a href="https://webpack.js.org/configuration/dev-server/#devserver-host" rel="nofollow noreferrer">here</a>, I have the following in my package.json</p>
  
  <pre><code>"scripts": {
    "start": "webpack-dev-server --host 0.0.0.0 --open",
    ...
  </code></pre>
  
  <p>With just <code>--open</code> it opens <code>localhost:8080</code> when I run <code>npm start</code>. When I add in <code>--host 0.0.0.0</code> it still opens, but opens <code>0.0.0.0:8080</code> and gives me <code>ERR_EMPTY_RESPONSE</code> in the browser.  I can manually change it to <code>localhost:8080</code> and it loads the page just fine.</p>
  
  <p>I tried <code>--host 0.0.0.0 --open --open-page localhost:8080</code> and it dutifully opens <code>http://0.0.0.0:8080/localhost:8080</code> for me in the browser.</p>
  
  <p>Has anyone gotten these two options to play nicely together?</p>