Overriding defaultHeaders and method not working Ext.Ajax override with sencha 6.2
<p>I had Ext.Ajax overriden with defaultHeaders and method in Extjs4.2-</p>

<pre><code>Ext.define('overrides.Ajax', {
override: 'Ext.Ajax',
defaultHeaders: { 'Content-Type': 'application/json; charset=utf-8' },
method: 'POST',
</code></pre>

<p>But with Extjs 6.2 defaultHeaders and method is not setting. Any idea on the issue?</p>