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Edit File: AbstractHandler.php

<?php
/**
 * Slim Framework (https://slimframework.com)
 *
 * @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
 */

namespace Slim\Handlers;

use AmeliaPsr\Http\Message\ServerRequestInterface;

abstract class AbstractHandler
{
    /**
     * Known handled content types
     *
     * @var array
     */
    protected $knownContentTypes = [
        'application/json',
        'application/xml',
        'text/xml',
        'text/html',
    ];

/**
     * Determine which content type we know about is wanted using `Accept` header
     *
     * Note: This method is a bare-bones implementation designed specifically for
     * Slim's error handling requirements. Consider a fully-feature solution such
     * as willdurand/negotiation for any other situation.
     *
     * @param ServerRequestInterface $request
     *
     * @return string
     */
    protected function determineContentType(ServerRequestInterface $request)
    {
        $acceptHeader = $request->getHeaderLine('Accept');
        $selectedContentTypes = array_intersect(explode(',', $acceptHeader), $this->knownContentTypes);

if (count($selectedContentTypes)) {
            return current($selectedContentTypes);
        }

// handle +json and +xml specially
        if (preg_match('/\+(json|xml)/', $acceptHeader, $matches)) {
            $mediaType = 'application/' . $matches[1];
            if (in_array($mediaType, $this->knownContentTypes)) {
                return $mediaType;
            }
        }

return 'text/html';
    }
}

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