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I'm facing issue using the googleapis package for Flutter/Dart. That's the code that I have...

import 'package:googleapis/gmail/v1.dart' as gMail;
import "package:googleapis_auth/auth_io.dart";
import 'package:flutter/services.dart' show rootBundle;

class Example 
 ServiceAccountCredentials credentials;

 Future<gMail.GmailApi> getGMailApi() async 
 return gMail.GmailApi(await getGoogleClient());
 

 Future<AuthClient> getGoogleClient() async 
 return await clientViaServiceAccount(await getCredentials(), [
 'https://www.googleapis.com/auth/drive',
 'https://mail.google.com/',
 ]);
 

 Future<ServiceAccountCredentials> getCredentials() async 
 if (credentials == null) 
 credentials = ServiceAccountCredentials.fromJson(
 json.decode(await rootBundle.loadString('GSuiteServiceAccountInfo.json')));
 

 return credentials;
 

 String getBase64Email(String source) 
 List<int> bytes = utf8.encode(source);
 String base64String = base64UrlEncode(bytes);

 return base64StringFormatted;
 

 sendEmail(
 String from: 'me',
 String to: 'someemail@gmail.com',
 String subject: 'Some subject',
 String contentType: 'text/html',
 String charset: 'utf-8',
 String contentTransferEncoding: 'base64',
 String emailContent: '<table></table>',
 ) async 
 (await getGMailApi()).users.messages.send(
 gMail.Message.fromJson(
 'raw': getBase64Email(
 source: 'From: $fromrn'
 'To: $torn'
 'Subject: $subjectrn'
 'Content-Type: $contentType; charset=$charsetrn'
 'Content-Transfer-Encoding: $contentTransferEncodingrnrn'
 '$emailContent'), // emailContent is HTML table.
 ),
 from);
 

When I call sendEmail function I get DetailedApiRequestError(status: 400, message: Bad Request). But when I try to send the base64UrlEncoded string through the playground it works, the email is sent.

Here is my flutter doctor -v:

[√] Flutter (Channel stable, v1.2.1, on Microsoft Windows [Version 10.0.17763.316], locale en-US)
 • Flutter version 1.2.1 at C:srcflutter-0.7.3flutter
 • Framework revision 8661d8aecd (3 weeks ago), 2019-02-14 19:19:53 -0800
 • Engine revision 3757390fa4
 • Dart version 2.1.2 (build 2.1.2-dev.0.0 0a7dcf17eb)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
 • Android SDK at C:UsersbbozhidarovAppDataLocalAndroidSdk
 • Android NDK location not configured (optional; useful for native profiling support)
 • Platform android-28, build-tools 28.0.3
 • ANDROID_HOME = C:UsersbbozhidarovAppDataLocalAndroidSdk
 • Java binary at: C:Program FilesAndroidAndroid Studiojrebinjava
 • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
 • All Android licenses accepted.

[√] Android Studio (version 3.3)
 • Android Studio at C:Program FilesAndroidAndroid Studio
 • Flutter plugin version 33.3.1
 • Dart plugin version 182.5215
 • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[!] IntelliJ IDEA Community Edition (version 2018.1)
 • IntelliJ at C:Program FilesJetBrainsIntelliJ IDEA Community Edition 2018.1.6
 X Flutter plugin not installed; this adds Flutter specific functionality.
 X Dart plugin not installed; this adds Dart specific functionality.
 • For information about installing plugins, see
 https://flutter.io/intellij-setup/#installing-the-plugins

[!] VS Code, 64-bit edition (version 1.30.2)
 • VS Code at C:Program FilesMicrosoft VS Code
 X Flutter extension not installed; install from
 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[√] Connected device (1 available)
 • Android SDK built for x86 • emulator-5554 • android-x86 • Android 8.1.0 (API 27) (emulator)

! Doctor found issues in 2 categories.

And this is my pubspec.yaml:

name: App Mobile
description: App Mobile

version: 1.0.0+1

environment:
 sdk: ">=2.0.0-dev.68.0 <3.0.0"

dependencies:
 flutter:
 sdk: flutter
 intl: 0.15.7
 cupertino_icons: 0.1.2
 http: 0.11.3+17
 shared_preferences: ^0.4.2
 google_api_availability: 1.0.4
 geolocator: 2.1.0
 file_picker: 0.1.6
 url_launcher: 4.0.3
 flutter_calendar_carousel: 1.3.10
 date_util: 0.1.4
 permission_handler: 2.1.0
 simple_permissions: 0.1.9
 logging: 0.11.3+2
 googleapis: 0.52.0+1
 uuid: 2.0.0
 googleapis_auth: 0.2.7

dev_dependencies:
 flutter_test:
 sdk: flutter

flutter:
 uses-material-design: true
 assets:
 - assets/email_templates/dynamic_form_email_template.html
 - assets/email_templates/dynamic_form_email_data_row_template.html
 - GSuiteServiceAccountInfo.json

I exclude the possibility of an issue with the credentials. The same credentials/account/client is working well with DriveApi. Any help will be much appreciated. Thanks.