shlink/config/autoload/errorhandler.local.php.dist

<?php
use Zend\Expressive\Container\WhoopsErrorResponseGeneratorFactory;

return [
    'dependencies' => [
        'invokables' => [
            'Zend\Expressive\Whoops' => Whoops\Run::class,
            'Zend\Expressive\WhoopsPageHandler' => Whoops\Handler\PrettyPageHandler::class,
        ],
    ],

    'whoops' => [
        'json_exceptions' => [
            'display'    => true,
            'show_trace' => true,
            'ajax_only'  => true,
        ],
    ],

    'error_handler' => [
        'plugins' => [
            'factories' => [
                'text/html' => WhoopsErrorResponseGeneratorFactory::class,
            ],
        ],
    ],
];