title: Authentication fails for REST requests to Shopware 5 using Postman
body: <p>When making REST requests like GET <code>http://&lt;url-to-shop&gt;/api/articles</code> to my own Shopware 5 instance I always get</p>
  <pre><code>{
      &quot;success&quot;: false,
      &quot;message&quot;: &quot;Invalid or missing auth&quot;
  }
  </code></pre>
  <p>as a response, even though I provide the correct credentials.</p>