<p>Les types de contenu corrects sont :</p>
<ul>
<li><strong>Pour .xlsx</strong> : <code>application/vnd.openxmlformats-officedocument.spreadsheetml.sheet</code></li>
<li><strong>Pour .xls</strong> : <code>application/vnd.ms-excel</code></li>
</ul>
<p>Exemple d’en-tête HTTP :</p>
<pre><code class="lang-auto">Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Content-Disposition: attachment; filename="rapport.xlsx"
</code></pre>