How to send arabic word with a http.Mutli part form data in flutter

I’m using the http package in order to send multi part – form data request to the server, it works great and the server are able to parse the files and fields, but I’m getting problem when trying to send with the request a field that contains arabic word then this field is parsed in the server as it is file.The server is unable to know that this field that contains arabic word is a field. I print the file in the server that contains the arabic word and it shows it’s mimetype as ‘text/plain; utf=8’ but it still put it with the files. I don’t know why even though I’m putting in the header

..headers[‘Content-Type’] = "multipart/form-data; charset=UTF-8"

 var request = http.MultipartRequest('POST', postUri)
    ..fields['username'] = _username!
    ..fields['password'] = _password!
    ..fields['address'] = 'تشيتتشسيتش يسشتيرشتي' // Here is the problem
    ..headers['Content-Type'] = "multipart/form-data; charset=UTF-8"
    ..files.add(await http.MultipartFile.fromPath(
      'coverPic',
      _coverImage!.path,
      contentType: MediaType('image', coverPicType),
    ));

>Solution :

To send an Arabic word with http.MultiPart form data in Flutter, you can use the MultipartFile.fromString() constructor and specify the character encoding for the string as follows:

import 'dart:convert';
import 'package:http/http.dart' as HTTP;

// Create a new http.MultipartRequest
var request = http.MultipartRequest('POST',     
Uri.parse('your_api_endpoint'));

// Add the Arabic word as a string to the request
String arabicWord = 'السلام عليكم';
request.fields['arabic'] = arabicWord;

// Encode the Arabic string to UTF-8
var encoding = Encoding.getByName('utf-8');

// Create a new multipart file from the encoded Arabic string
var arabicFile = http.MultipartFile.fromString('arabic', arabicWord, 
contentType: MediaType('text', 'plain', {'charset': 'utf-8'}));

// Add the Arabic file to the request
request.files.add(arabicFile);

// Send the request
var response = await request.send();

In this example, the arabicWord is added to the request as a string using the request.fields map. The string is then encoded to UTF-8 using the Encoding.getByName() method. Finally, a new MultipartFile is created from the encoded string and added to the request using the request.files list.