bootstrap.php
<?php
// initialize Magento environment
 
try {
//    if you move this file, adjust bootstrap.php path
    require __DIR__ . '/../../../../../app/bootstrap.php';
} catch (\Exception $e) {
    echo <<<HTML
{$e->getMessage()}
</div>
HTML;
    exit(1);
}
 
$params = $_SERVER;
$params[\Magento\Store\Model\StoreManager::PARAM_RUN_CODE] = 'admin'; // change this to appropriate store if needed.
$params[\Magento\Store\Model\Store::CUSTOM_ENTRY_POINT_PARAM] = true;
$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $params); // bootstrap
 
/** @var \Magento\Framework\App\Http $app */
$app = $bootstrap->createApplication('Magento\Framework\App\Http');
 
// configure environment
$om = $bootstrap->getObjectManager();
$areaList = $om->get('Magento\Framework\App\AreaList');
$areaCode = $areaList->getCodeByFrontName('admin');
/** @var \Magento\Framework\App\State $state */
$state = $om->get('Magento\Framework\App\State');
$state->setAreaCode($areaCode);
/** @var \Magento\Framework\ObjectManager\ConfigLoaderInterface $configLoader */
$configLoader = $om->get('Magento\Framework\ObjectManager\ConfigLoaderInterface');
$om->configure($configLoader->load($areaCode));
// end initialize Magento environment
urapidflow.php
<?php
include __DIR__ . '/bootstrap.php';
 
// download from http location
$res = @copy('http://remote.server.com/archive.zip', $targetDir . 'archive.zip');
if ($res !== true) {
    echo 'ERROR downloading file';
    exit;
}
 
// unpack the archive
$zip = new ZipArchive();
$res = $zip->open($targetDir . 'archive.zip');
if ($res !== true) {
    echo 'ERROR unpacking archive';
    exit;
}
$zip->extractTo($targetDir);
$zip->close();
 
// run the profile, which should be associated with final import file
$om->get('\Unirgy\RapidFlow\Helper\Data')->run('Your Import Profile');