Simple rest controller to get page by slug

anyrest.php

<?php
/**
 * @package Any_Rest
 * @version 1.7
 */
/*
Plugin Name: Any Rest
Description: Get any page by slug

Usage: http://test1.localhost/wp-json/anyrest/v2/apt?slug=hello-world
*/

add_action('rest_api_init', 'any_post_api_route');
function any_post_api_route()
{
    register_rest_route('anyrest/v2', '/apt/', [
        'methods' => 'GET',
        'callback' => 'get_content_by_slug',
        'args' =>[
            'slug' => ['required' => false]
						]
		]);
}

/**
 *
 * Get content by slug
 *
 * @param WP_REST_Request $request
 * @return WP_REST_Response
 */
function get_content_by_slug(WP_REST_Request $request)
{

    // get slug from request
    $slug = $request['slug'];

    // get title by slug
    $return = get_page_by_path($slug, ARRAY_A, array('page', 'post'));
		
		if ( $return['post_content'] ) {
			$response = new WP_REST_Response( $return );
		} else {
			$response = new WP_Error( 'post_empty', 'Post is empty', array( 'status' => 404 ) );
		}
		
		return $response;
}