lts to <code>&quot;&quot;</code> if <code>extract</code> is defined, <code>&quot;json&quot;</code> if missing. If <code>responseType: &quot;json&quot;</code>, it internally performs <code>JSON.parse(responseText)</code>.</td>
</tr>
<tr>
<td><code>options.config</code></td>
<td><code>xhr = Function(xhr)</code></td>
<td>No</td>
<td>Exposes the underlying XMLHttpRequest object for low-level configuration and optional replacement (by returning a new XHR).</td>
</tr>
<tr>
<td><code>options.headers</code></td>
<t