Redirects being built as http://localhost:8888/drupal8 and not considered safe by RedirectResponseSubscriber

In my case I was getting error because Drupal is behind reverse proxy. My problem is that it is a bunch of different servers all pointing to different subdirectories, while I do not have an access to the main server where the main website lives.

So in my case I did not need to "remove" the subdirectory but ADD the subdirectory instead. Which worked, but also resulted in TrustedRedirect errors.

My settings.php file is:

$trim_path = '/subdirectory';
if (isset($GLOBALS['request'])) {
  $request = $GLOBALS['request'];
  if ($request->server->get('SCRIPT_NAME') == "/index.php") {
    $request->server->set('SCRIPT_NAME', '/subdirectory/index.php');
	$request_uri = $trim_path . substr($request->server->get('REQUEST_URI'), 1);
	
	$request->server->set('REQUEST_URI', $request_uri);
  }
}

To fix trustedRedirect errors I used rather stupid jquery front-end fix, but it works:

/* Fix trustedRedirectResponse */
$( document ).ajaxComplete(function (event, xhr, settings) {
	
	$("a").each(function() {
		$(this).attr("href", $(this).attr("href").replace("edit?destination=/node/", "edit?destination=/subdirectory/node/"));
	});
	
});

I had trouble in ajaxified views, which lead to wrong redirects but it was all in GET parameter, so this basicly just replaces href attribute with proper URL.

#76 is the only solution, clean and worked perfectly for installing Drupal10 in a subfolder of root folder /public_html for a primary domain on linux deluxe shared account on godaddy.

#76 works for me with Drupal10 with hostinger.

I have adapted the path :

if (isset($GLOBALS['request']) and
'/web/index.php' === $GLOBALS['request']->server->get('SCRIPT_NAME')) {
$GLOBALS['request']->server->set('SCRIPT_NAME', '/index.php');
}

#76 worked for me