/**
 * Return canned body content for invalid HTTP requests.
 *
 * In this example, "invalid" would be defined as any status code other than
 * 200, 301, or 302.
 *
 * @see WP_Http::request()
 *
 * @param array  $response The HTTP response.
 * @param array  $args     Request arguments. 
 * @param string $url      Request URL.
 *
 * @return array The filtered HTTP response.
*/
function wpdocs_invalid_request_response( $response, $args, $url ) {
	if ( ! in_array( $response['response']['code'], array( 200, 301, 302 ) ) ) {
		$response['body'] = __( 'No content found', 'yourtextdomain' );
	}
	return $response;
}
add_filter( 'http_response', 'wpdocs_invalid_request_response', 10, 3 );