Icicle\Http\Message\BasicRequest::filterTarget PHP Method

    protected function filterTarget(string $target = null)
    {
        if (null === $target || '' === $target) {
            return null;
        }
        if ('/' === $target[0]) {
            return new BasicUri($target);
        }
        if (preg_match('/^https?:\\/\\//i', $target)) {
            // absolute-form
            return new BasicUri($target);
        }
        if (strrpos($target, ':', -1)) {
            return new BasicUri($target);
        }
        return new BasicUri('//' . $target);
    }