Slim 3 Middleware - Force HTTPS

index.php

$app->add(function (Request $request,  Response $response, $next) {
    if ($request->getUri()->getScheme() !== 'https') {
        $uri = $request->getUri()->withScheme("https")->withPort(null);
        return $response->withRedirect( (string)$uri );
    } else {
        return $next($request, $response);
    }
});

This code still works well. However, in my case at least I had an error

Argument 1 passed to Closure::{closure}() must be an instance of Request, instance of Slim\Http\Request given

Therefore, I changed the header of the function to function ($request, $response, $next) and it worked.

The Request type hint undestands itself under current namespace, if not “use-statemented” otherwise. So you possibly forgot a use statement in your script, like this:

use Psr\Http\Message\ServerRequestInterface as Request;