Zend\Diactoros\RequestTrait::createUri PHP Method

    private function createUri($uri)
    {
        if ($uri instanceof UriInterface) {
            return $uri;
        }
        if (is_string($uri)) {
            return new Uri($uri);
        }
        if ($uri === null) {
            return new Uri();
        }
        throw new InvalidArgumentException('Invalid URI provided; must be null, a string, or a Psr\\Http\\Message\\UriInterface instance');
    }