The document is a JSON object representing a blog post with the title "Hello world!". It contains metadata about the post such as its ID, date published, last modified date, slug, status, type, and link. The content field includes an introductory paragraph welcoming the reader.

41. {"id":1,
"date":"2017-05-23T06:25:50",
"date_gmt":"2017-05-23T06:25:50",
"guid":{"rendered":"http://demo.wp-api.org/?p=1"},
"modified":"2017-05-23T06:25:50",
"modified_gmt":"2017-05-23T06:25:50",
"slug":"hello-world",
"status":"publish",
"type":"post",
"link":"https://demo.wp-api.org/2017/05/23/hello-world/",
"title":{"rendered":"Hello world!"},
"content":{"rendered":"<p>Welcome to...

44. add_action( 'rest_api_init', function () {
register_rest_route( 'anything/v1', '/get',
array(
'methods' => 'GET',
'callback' => 'get_anything_awesome',
) );
} );
function get_anything_awesome() {
$data = array('result' => 'great data');
return new WP_REST_Response( $data, 200 );
}

45. wp core update
wp theme status
wp plugin activate wp-multibyte-patch