_fetch_with_format example

        $provider = apply_filters( 'oembed_fetch_url', $provider, $url, $args );

        foreach ( array( 'json', 'xml' ) as $format ) {
            $result = $this->_fetch_with_format( $provider, $format );
            if ( is_wp_error( $result ) && 'not-implemented' === $result->get_error_code() ) {
                continue;
            }

            return ( $result && ! is_wp_error( $result ) ) ? $result : false;
        }

        return false;
    }

    /** * Fetches result from an oEmbed provider for a specific format and complete provider URL * * @since 3.0.0 * * @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.) * @param string $format Format to use. * @return object|false|WP_Error The result in the form of an object on success, false on failure. */