fix multipart files

+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 import 'routes/app_pages.dart';
 import 'shared/logger/logger_utils.dart';
 
-void main() {
+void main() async {
+  final client = GetConnect();
+  final form = FormData({
+    'file': MultipartFile(
+      File('README.md').readAsBytesSync(),
+      filename: 'readme.md',
+    ),
+  });
+  final response = await client.post('http://localhost:8080/upload', form);
+
+  print(response.body);
+  WidgetsFlutterBinding.ensureInitialized();
   runApp(MyApp());
 }
 

@@ -94,15 +94,17 @@ class GetHttpClient {
     List<int> bodyBytes;
     BodyBytes bodyStream;
     final headers = <String, String>{};
-    headers['content-type'] = contentType ?? defaultContentType;
+
     headers['user-agent'] = userAgent;
 
     if (body is FormData) {
       bodyBytes = await body.toBytes();
       headers['content-length'] = bodyBytes.length.toString();
+      headers['content-type'] =
+          'multipart/form-data; boundary=${body.boundary}';
     } else if (body is Map || body is List) {
       var jsonString = json.encode(body);
-
+      headers['content-type'] = contentType ?? defaultContentType;
       //TODO check this implementation
       if (contentType != null) {
         if (contentType.toLowerCase() == 'application/x-www-form-urlencoded') {
@@ -114,6 +116,7 @@ class GetHttpClient {
       bodyBytes = utf8.encode(jsonString);
       headers['content-length'] = bodyBytes.length.toString();
     } else if (body == null) {
+      headers['content-type'] = contentType ?? defaultContentType;
       headers['content-length'] = '0';
     } else {
       if (!errorSafety) {
@@ -126,7 +129,7 @@ class GetHttpClient {
     }
 
     final uri = _createUri(url, query);
-
+    print(headers);
     return Request(
       method: method,
       url: uri,

 import 'dart:async';
 import 'dart:convert';
 import 'dart:math';
-import '../../../../get_rx/src/rx_stream/rx_stream.dart';
 import '../request/request.dart';
 import '../utils/utils.dart';
 import 'multipart_file.dart';
 
 class FormData {
   FormData(Map<String, dynamic> map) : boundary = _getBoundary() {
-    urlEncode(map, '', false, (key, value) {
-      if (value == null) return;
-      (value is MultipartFile)
-          ? files.add(MapEntry(key, value))
-          : fields.add(MapEntry(key, value.toString()));
-      return;
+    map.forEach((key, value) {
+      if (value == null) return null;
+      if (value is MultipartFile) {
+        files.add(MapEntry(key, value));
+      } else if (value is List<MultipartFile>) {
+        files.addAll(value.map((e) => MapEntry(key, e)));
+      } else {
+        fields.add(MapEntry(key, value.toString()));
+      }
     });
   }
 
@@ -87,25 +89,27 @@ class FormData {
   }
 
   Future<List<int>> toBytes() {
-    final getStream = GetStream<List<int>>();
+    return BodyBytes(_encode()).toBytes();
+  }
 
-    for (final item in fields) {
-      stringToBytes('--$boundary\r\n', getStream);
-      stringToBytes(_fieldHeader(item.key, item.value), getStream);
-      stringToBytes(item.value, getStream);
-      writeLine(getStream);
-    }
+  Stream<List<int>> _encode() async* {
+    const line = [13, 10];
+    final separator = utf8.encode('--$boundary\r\n');
+    final close = utf8.encode('--$boundary--\r\n');
 
-    Future.forEach<MapEntry<String, MultipartFile>>(files, (file) {
-      stringToBytes('--$boundary\r\n', getStream);
-      stringToBytes(_fileHeader(file), getStream);
+    for (var field in fields) {
+      yield separator;
+      yield utf8.encode(_fieldHeader(field.key, field.value));
+      yield utf8.encode(field.value);
+      yield line;
+    }
 
-      return streamToFuture(file.value.stream, getStream)
-          .then((_) => writeLine(getStream));
-    }).then((_) {
-      stringToBytes('--$boundary--\r\n', getStream);
-      getStream.close();
-    });
-    return BodyBytes(getStream.stream).toBytes();
+    for (final file in files) {
+      yield separator;
+      yield utf8.encode(_fileHeader(file));
+      yield* file.value.stream;
+      yield line;
+    }
+    yield close;
   }
 }

 import 'dart:async';
 import 'dart:convert';
-import '../../../../get_rx/src/rx_stream/rx_stream.dart';
 import '../request/request.dart';
 
 bool isTokenChar(int byte) {
@@ -66,67 +65,13 @@ final newlineRegExp = RegExp(r'\r\n|\r|\n');
 /// characters.
 bool isPlainAscii(String string) => _asciiOnly.hasMatch(string);
 
-StringBuffer urlEncode(
-  dynamic sub,
-  String path,
-  bool encode,
-  String Function(String key, Object value) handler,
-) {
-  var urlData = StringBuffer('');
-  var leftBracket = '[';
-  var rightBracket = ']';
-
-  if (encode) {
-    leftBracket = '%5B';
-    rightBracket = '%5D';
-  }
-
-  var encodeComponent = encode ? Uri.encodeQueryComponent : (e) => e;
-  if (sub is Map) {
-    sub.forEach((key, value) {
-      if (path == '') {
-        urlEncode(
-          value,
-          '${encodeComponent(key as String)}',
-          encode,
-          handler,
-        );
-      } else {
-        urlEncode(
-          value,
-          '$path$leftBracket${encodeComponent(key as String)}$rightBracket',
-          encode,
-          handler,
-        );
-      }
-    });
-  } else {
-    throw 'FormData need be a Map';
-  }
-
-  return urlData;
-}
-
 const String GET_BOUNDARY = 'getx-http-boundary-';
 
-Future streamToFuture(Stream stream, GetStream sink) {
-  var completer = Completer();
-  stream.listen(sink.add,
-      onError: sink.addError, onDone: () => completer.complete());
-  return completer.future;
-}
-
-void stringToBytes(String string, GetStream stream) {
-  stream.add(utf8.encode(string));
-}
-
 /// Encode [value] like browsers
 String browserEncode(String value) {
   return value.replaceAll(newlineRegExp, '%0D%0A').replaceAll('"', '%22');
 }
 
-void writeLine(GetStream stream) => stream.add([13, 10]);
-
 const List<int> boundaryCharacters = <int>[
   43,
   95,