I am trying to get data from the server, but the server’s response is like this:

<br />
<b>Warning</b>:  Undefined variable $response in <b>/home/sasansaf/techblog.sasansafari.com/Techblog/api/article/Model/ArticleModel.php</b> on line <b>191</b><br />
<br />
<b>Warning</b>:  foreach() argument must be of type array|object,
null given in <b>/home/sasansaf/techblog.sasansafari.com/Techblog/api/article/Model/ArticleModel.php</b> on line <b>125</b><br />
<br />
<b>Warning</b>:  Undefined variable $tags in <b>/home/sasansaf/techblog.sasansafari.com/Techblog/api/article/Model/ArticleModel.php</b> on line <b>175</b><br />
{
    "info": {
        "id": "19",
        "title": "فلاتر",
        "content": "من متن و بدنه اصلی مقاله هستم ، اگه میخوای من رو ویرایش کنی و یه مقاله جذاب بنویسی ، نوشته آبی رنگ بالا که نوشته "ویرایش متن اصلی مقاله" رو با انگشتت لمس کن تا وارد ویرایشگر بشی",
        "image": "/Techblog/assets/upload/images/article/20221218092957.jpg",
        "cat_id": "4",
        "cat_name": "سخت افزار",
        "author": null,
        "view": "7",
        "status": "0",
        "created_at": "۱۴۰۱/۹/۲۷"
    },
    "isFavorite": false,
    "related": [
        {
            "id": "18",
            "title": "فلاتر",
            "image": "/Techblog/assets/upload/images/article/20221218091728.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "11",
            "status": "0",
            "created_at": "۱۴۰۱/۹/۲۷"
        },
        {
            "id": "19",
            "title": "فلاتر",
            "image": "/Techblog/assets/upload/images/article/20221218092957.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "7",
            "status": "0",
            "created_at": "۱۴۰۱/۹/۲۷"
        },
        {
            "id": "24",
            "title": "آموزش زبان انگلیسی",
            "image": "/Techblog/assets/upload/images/article/20221219074227.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "6",
            "status": "0",
            "created_at": "۱۴۰۱/۹/۲۸"
        },
        {
            "id": "46",
            "title": "ابنجا عنوان مقاله قرار میگیره! پس یه عنوان جذاب انتخاب کن.",
            "image": "/Techblog/assets/upload/images/article/20230107133032.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "",
            "view": "2",
            "status": "0",
            "created_at": "۱۴۰۱/۱۰/۱۷"
        },
        {
            "id": "77",
            "title": "بروشورر",
            "image": "/Techblog/assets/upload/images/article/20230315182040.instagram",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۱/۱۲/۲۴"
        },
        {
            "id": "88",
            "title": "uy",
            "image": "/Techblog/assets/upload/images/article/20230405035448.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۱/۱۶"
        },
        {
            "id": "89",
            "title": "uy",
            "image": "/Techblog/assets/upload/images/article/20230405035545.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۱/۱۶"
        },
        {
            "id": "90",
            "title": "uy",
            "image": "/Techblog/assets/upload/images/article/20230405035547.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۱/۱۶"
        },
        {
            "id": "91",
            "title": "uy",
            "image": "/Techblog/assets/upload/images/article/20230405055919.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۱/۱۶"
        },
        {
            "id": "120",
            "title": "اینجا عنوان مقاله قرار میگیره،یه عنوان جذاب انتخاب کن",
            "image": "/Techblog/assets/upload/images/article/20230608195254.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "1",
            "status": "0",
            "created_at": "۱۴۰۲/۳/۱۸"
        },
        {
            "id": "144",
            "title": "dsfsdfh",
            "image": "/Techblog/assets/upload/images/article/20230910063715.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "1",
            "status": "0",
            "created_at": "۱۴۰۲/۶/۱۹"
        },
        {
            "id": "150",
            "title": "تست عنوان",
            "image": "/Techblog/assets/upload/images/article/20230921155019.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "4",
            "status": "0",
            "created_at": "۱۴۰۲/۶/۳۰"
        },
        {
            "id": "151",
            "title": "تست عنوان",
            "image": "/Techblog/assets/upload/images/article/20230921155110.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "2",
            "status": "0",
            "created_at": "۱۴۰۲/۶/۳۰"
        },
        {
            "id": "154",
            "title": "عکس متن انگلیسی",
            "image": "/Techblog/assets/upload/images/article/20230922075402.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "4",
            "status": "0",
            "created_at": "۱۴۰۲/۶/۳۱"
        },
        {
            "id": "157",
            "title": "who?me?",
            "image": "/Techblog/assets/upload/images/article/20230922091722.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "27",
            "status": "0",
            "created_at": "۱۴۰۲/۶/۳۱"
        },
        {
            "id": "164",
            "title": "yfgkb",
            "image": "/Techblog/assets/upload/images/article/20231001115409.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "1",
            "status": "0",
            "created_at": "۱۴۰۲/۷/۹"
        },
        {
            "id": "168",
            "title": "hguhf",
            "image": "/Techblog/assets/upload/images/article/20231001120959.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۷/۹"
        },
        {
            "id": "198",
            "title": "wewe",
            "image": "/Techblog/assets/upload/images/article/20231029145614.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۷"
        },
        {
            "id": "199",
            "title": "wewe",
            "image": "/Techblog/assets/upload/images/article/20231029145646.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۷"
        },
        {
            "id": "200",
            "title": "wewe",
            "image": "/Techblog/assets/upload/images/article/20231029145653.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۷"
        },
        {
            "id": "253",
            "title": "wewe",
            "image": "/Techblog/assets/upload/images/article/20231104190629.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "Ahmad",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۱۳"
        },
        {
            "id": "254",
            "title": "wewe",
            "image": "/Techblog/assets/upload/images/article/20231104190635.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "Ahmad",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۱۳"
        },
        {
            "id": "255",
            "title": "مفهوم  نوآوری باز",
            "image": "/Techblog/assets/upload/images/article/20231114102501.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "54",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۲۳"
        },
        {
            "id": "257",
            "title": "❤️ i mew you",
            "image": "/Techblog/assets/upload/images/article/20231116112751.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "9",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۲۵"
        },
        {
            "id": "259",
            "title": "مفهوم اکوسیستم کارآفرینی",
            "image": "/Techblog/assets/upload/images/article/20231117191005.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "8",
            "status": "0",
            "created_at": "۱۴۰۲/۸/۲۶"
        },
        {
            "id": "317",
            "title": "کاراکتر",
            "image": "/Techblog/assets/upload/images/article/20240219061026.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "14",
            "status": "0",
            "created_at": "۱۴۰۲/۱۱/۳۰"
        },
        {
            "id": "318",
            "title": "کاراکتر",
            "image": "/Techblog/assets/upload/images/article/20240219062634.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "13",
            "status": "0",
            "created_at": "۱۴۰۲/۱۱/۳۰"
        },
        {
            "id": "319",
            "title": "کاراکتر",
            "image": "/Techblog/assets/upload/images/article/20240219062643.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "4",
            "status": "0",
            "created_at": "۱۴۰۲/۱۱/۳۰"
        },
        {
            "id": "320",
            "title": "کاراکتر",
            "image": "/Techblog/assets/upload/images/article/20240219062651.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۱۱/۳۰"
        },
        {
            "id": "321",
            "title": "کاراکتر",
            "image": "/Techblog/assets/upload/images/article/20240219062704.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۲/۱۱/۳۰"
        },
        {
            "id": "355",
            "title": "ماشین لرنینگ",
            "image": "/Techblog/assets/upload/images/article/20240502134120.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": null,
            "view": "2",
            "status": "0",
            "created_at": "۱۴۰۳/۲/۱۳"
        },
        {
            "id": "381",
            "title": "آره بابا",
            "image": "/Techblog/assets/upload/images/article/20240520092835.jpg",
            "cat_id": "4",
            "cat_name": "سخت افزار",
            "author": "''",
            "view": "0",
            "status": "0",
            "created_at": "۱۴۰۳/۲/۳۱"
        }
    ],
    "tags": null
}

I don’t have access to the backend developer to solve this problem, so how can I solve this problem with Flutter?

This is my piece of code in getting data from the server side

Future<dynamic> getMethod(String url) async {
    Dio dio = Dio();
    dio.options.headers['content-type'] = 'application/json';
    var response= await dio
        .get(url,
            options: Options(responseType: ResponseType.json, method: 'Get'))
        .then((response) {
      //log(response.toString());
      return response;
    });
    
    return response;
  }

This is an error:

Exception has occurred.

–

DioException (DioException [unknown]: null Error: FormatException: Unexpected character (at character 1) <br /> ^ )

this is an error