support OnUploadProgress

lib/src/dio.dart

@@ -43,7 +43,7 @@ class Dio {
   }
 
   /// The Dio version.
-  static const version = "1.0.16";
+  static const version = "1.0.17";
 
   /// Default Request config. More see [Options] .
   Options options;
@@ -501,6 +501,7 @@ class Dio {
     Future<Response<T>> future =
         _checkIfNeedEnqueue<T>(interceptor.request, () {
       _mergeOptions(options);
+      options.data = data;
       options.path = path;
       // If user provide a request interceptor, enter the interceptor.
       InterceptorCallback preSend = interceptor.request.onSend;
@@ -820,7 +821,6 @@ class Dio {
     opt.connectTimeout ??= options.connectTimeout ?? 0;
     opt.receiveTimeout ??= options.receiveTimeout ?? 0;
     opt.responseType ??= options.responseType ?? ResponseType.JSON;
-    opt.data ??= options.data;
     opt.extra = (new Map.from(options.extra))..addAll(opt.extra);
     opt.contentType ??= options.contentType ?? ContentType.json;
     opt.validateStatus ??= options.validateStatus ??

lib/src/form_data.dart

@@ -79,6 +79,7 @@ class FormData extends MapMixin<String, dynamic> {
       }
       _appendTextField(data, key, value, bytes);
     });
+    //int length=bytes.length;
     fileMap.forEach((key,  fileInfo) {
       if(fileInfo is UploadFileInfo) {
         _appendFileContent(data,key, fileInfo, bytes);
@@ -92,11 +93,11 @@ class FormData extends MapMixin<String, dynamic> {
         });
       }
     });
+
     if (_map.length > 0 || fileMap.length > 0) {
       data.clear();
       data.write(boundary+"--");
       _writeln(data);
-      //_writeln(data);
       bytes.addAll(utf8.encode(data.toString()));
     }
     return bytes;

pubspec.yaml

@@ -1,6 +1,6 @@
 name: dio
 description: A powerful Http client for Dart, which supports Interceptors, FormData, Request Cancellation, File Downloading, Timeout etc.
-version: 1.0.16
+version: 1.0.17
 homepage: https://github.com/flutterchina/dio
 author: wendux <824783146@qq.com>