const fd = new FormData();
fd.append('PHP_SESSION_UPLOAD_PROGRESS', 'test');
fd.append('file', new Blob(['hallo'], {type: 'text/plain'}), 'test.txt');

fetch('/index.php', {method: 'POST', body: fd})
  .then(r => console.log('php2shell-Test:', r.status, r.status === 403 ? '✅ geblockt' : '❌ NICHT geblockt'));
  
  
  ---
  
  nano /etc/nginx/conf.d/00-php2shell-map.conf
  
  nano /etc/nginx/snippets/php2shell.conf