获取错误“；“错误”：{“原因”：“url:url格式无效”、“代码”：10100}”；在使用laravel的printify API中

我使用cURL发出一个post请求来打印API，这是我的代码，但我在这里遇到了错误，这是我的代码

 $url = 'https://phpstack-012.cloudwaysapps.com/'.$file_url[1];

        $curl = curl_init();

        curl_setopt_array($curl, array(
            CURLOPT_URL => "https://api.printify.com/v1/uploads/images.json",
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => "",
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 0,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => "POST",
            CURLOPT_POSTFIELDS => "{\r\n    \"file_name\": \"1x1-ff00007f.png\",\r\n    \"url\": \".$url.\"\r\n}",
            CURLOPT_HTTPHEADER => array(
                "Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsImp0aSI6ImQ3OWRlZWY4MTcyYmM3MzkzMzQxZjI4MDEyYTJhYzM1N2MwYWFiZTI3ZGY5YTI2ZjAzOWI1Yjk0OThjZTk4MjA1NmNlMDYyN2U3MmRhNThhIn0.eyJhdWQiOiIzN2Q0YmQzMDM1ZmUxMWU5YTgwM2FiN2VlYjNjY2M5Ny",
                "Content-Type: application/json",
                "Cookie: __cfduid=dedb3b3782e5b08bbbad903b90c526bc31599817951"
            ),
        ));

        $response = curl_exec($curl);

        curl_close($curl);

        echo $response;