Flutter web app encounters error when sending GET request with body

I’m currently developing a Flutter web application where I’ve encountered an issue specifically when attempting to send a GET request with a body. The application works as expected on Chrome, but upon sending this particular request, I consistently receive an error indicating that the body is empty.

I’ve tried using both the HTTP and Dio packages, and I’ve also added the ' Access-Control-Allow-Origin' header to handle cross-origin issues, but the problem persists. Is there a known workaround or solution to successfully send GET requests with bodies in Flutter web apps? Any insights, code samples, or alternative approaches would be immensely helpful. Thank you!

********** Edit **********

Get with body work in ANDROID and IOS

   //sample code
    Map<String, String> header = {};

    String? token = SharedPrefsHelper.getString(prefToken);

    String langCode = SharedPrefsHelper.getString(prefLanguageCode) ?? 
     "ar";

    header['content-type'] = 'application/json';
    header["Authorization"] = "bearer $token";
    header["Accept-Language"] = langCode;

    final request = Request('GET', 
    Uri.parse(url))..headers.addAll(header);
    request.body = json.encode(parameter);
    final response = await request.send()