WP_oEmbed_Controller::register_routes

	public function register_routes() {
		/**
		 * Filters the maxwidth oEmbed parameter.
		 *
		 * @since 4.4.0
		 *
		 * @param int $maxwidth Maximum allowed width. Default 600.
		 */
		$maxwidth = apply_filters( 'oembed_default_width', 600 );

		register_rest_route(
			'oembed/1.0',
			'/embed',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_item' ),
					'permission_callback' => '__return_true',
					'args'                => array(
						'url'      => array(
							'description' => __( 'The URL of the resource for which to fetch oEmbed data.' ),
							'required'    => true,
							'type'        => 'string',
							'format'      => 'uri',
						),
						'format'   => array(
							'default'           => 'json',
							'sanitize_callback' => 'wp_oembed_ensure_format',
						),
						'maxwidth' => array(
							'default'           => $maxwidth,
							'sanitize_callback' => 'absint',
						),
					),
				),
			)
		);

		register_rest_route(
			'oembed/1.0',
			'/proxy',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_proxy_item' ),
					'permission_callback' => array( $this, 'get_proxy_item_permissions_check' ),
					'args'                => array(
						'url'       => array(
							'description' => __( 'The URL of the resource for which to fetch oEmbed data.' ),
							'required'    => true,
							'type'        => 'string',
							'format'      => 'uri',
						),
						'format'    => array(
							'description' => __( 'The oEmbed format to use.' ),
							'type'        => 'string',
							'default'     => 'json',
							'enum'        => array(
								'json',
								'xml',
							),
						),
						'maxwidth'  => array(
							'description'       => __( 'The maximum width of the embed frame in pixels.' ),
							'type'              => 'integer',
							'default'           => $maxwidth,
							'sanitize_callback' => 'absint',
						),
						'maxheight' => array(
							'description'       => __( 'The maximum height of the embed frame in pixels.' ),
							'type'              => 'integer',
							'sanitize_callback' => 'absint',
						),
						'discover'  => array(
							'description' => __( 'Whether to perform an oEmbed discovery request for unsanctioned providers.' ),
							'type'        => 'boolean',
							'default'     => true,
						),
					),
				),