Url.php

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<?php
namespace Magento\Framework\Validator;

class Url
{
    public function isValid($value, array $allowedSchemes = [])
    {
        $isValid = true;

        if (!filter_var($value, FILTER_VALIDATE_URL)) {
            $isValid = false;
        }

        if ($isValid && !empty($allowedSchemes)) {
            $url = parse_url($value);
            if (empty($url['scheme']) || !in_array($url['scheme'], $allowedSchemes)) {
                $isValid = false;
            }
        }

        return $isValid;
    }
}