Tsfe::forceAbsoluteUrls() 

\nn\t3::Tsfe()->forceAbsoluteUrls($enable = true); 

Sets config.absRefPrefix to the current URL.

This means that when rendering the links of content elements absolute URLs are used. Does not (yet) work for images.

\nn\t3::Environment()->forceAbsoluteUrls();
$html = \nn\t3::Content()->render(123);
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Source Code 

public function forceAbsoluteUrls( $enable = true )
{
	$request = \nn\t3::Environment()->getRequest();
	$fts = $request->getAttribute('frontend.typoscript');
	if (!$fts) return $request;
	$base = rtrim((string)$request->getAttribute('site')->getBase(), '/') . '/';
	$config = $fts->getConfigArray() ?? [];
	$config['absRefPrefix'] = $base;
	$config['forceAbsoluteUrls'] = $enable;
	if (method_exists($fts, 'setConfigArray')) {
		$fts->setConfigArray($config);
		$request = $request->withAttribute('frontend.typoscript', $fts);
	}
	\nn\t3::Environment()->setRequest($request);
	return $request;
}
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