diff --git a/packages/wyatt_http_client/example/http_client_fastapi_example.dart b/packages/wyatt_http_client/example/http_client_fastapi_example.dart
new file mode 100644
index 00000000..21c13b42
--- /dev/null
+++ b/packages/wyatt_http_client/example/http_client_fastapi_example.dart
@@ -0,0 +1,386 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+// ignore_for_file: public_member_api_docs, sort_constructors_first
+import 'dart:convert';
+
+import 'package:wyatt_http_client/src/authentication/refresh_token_client.dart';
+import 'package:wyatt_http_client/src/rest_client.dart';
+import 'package:wyatt_http_client/src/utils/protocols.dart';
+
+enum EmailVerificationAction {
+  signUp,
+  resetPassword,
+  changeEmail;
+
+  String toSnakeCase() {
+    return name.splitMapJoin(
+      RegExp('[A-Z]'),
+      onMatch: (m) => '_${m[0]?.toLowerCase()}',
+      onNonMatch: (n) => n,
+    );
+  }
+
+  factory EmailVerificationAction.fromString(String str) {
+    return EmailVerificationAction.values.firstWhere(
+      (EmailVerificationAction element) => element.toSnakeCase() == str,
+    );
+  }
+}
+
+class VerifyCode {
+  final String email;
+  final String verificationCode;
+  final EmailVerificationAction action;
+  VerifyCode({
+    required this.email,
+    required this.verificationCode,
+    required this.action,
+  });
+
+  VerifyCode copyWith({
+    String? email,
+    String? verificationCode,
+    EmailVerificationAction? action,
+  }) {
+    return VerifyCode(
+      email: email ?? this.email,
+      verificationCode: verificationCode ?? this.verificationCode,
+      action: action ?? this.action,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'email': email,
+      'verification_code': verificationCode,
+      'action': action.toSnakeCase(),
+    };
+  }
+
+  factory VerifyCode.fromMap(Map<String, dynamic> map) {
+    return VerifyCode(
+      email: map['email'] as String,
+      verificationCode: map['verification_code'] as String,
+      action: EmailVerificationAction.fromString(map['action'] as String),
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory VerifyCode.fromJson(String source) =>
+      VerifyCode.fromMap(json.decode(source) as Map<String, dynamic>);
+
+  @override
+  String toString() =>
+      'VerifyCode(email: $email, verificationCode: $verificationCode, action: $action)';
+}
+
+class Account {
+  final String email;
+  final String? sessionId;
+  Account({
+    required this.email,
+    this.sessionId,
+  });
+
+  Account copyWith({
+    String? email,
+    String? sessionId,
+  }) {
+    return Account(
+      email: email ?? this.email,
+      sessionId: sessionId ?? this.sessionId,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'email': email,
+      'session_id': sessionId,
+    };
+  }
+
+  factory Account.fromMap(Map<String, dynamic> map) {
+    return Account(
+      email: map['email'] as String,
+      sessionId: map['session_id'] != null ? map['session_id'] as String : null,
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory Account.fromJson(String source) =>
+      Account.fromMap(json.decode(source) as Map<String, dynamic>);
+
+  @override
+  String toString() => 'Account(email: $email, sessionId: $sessionId)';
+}
+
+class SignUp {
+  final String sessionId;
+  final String password;
+  SignUp({
+    required this.sessionId,
+    required this.password,
+  });
+
+  SignUp copyWith({
+    String? sessionId,
+    String? password,
+  }) {
+    return SignUp(
+      sessionId: sessionId ?? this.sessionId,
+      password: password ?? this.password,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'session_id': sessionId,
+      'password': password,
+    };
+  }
+
+  factory SignUp.fromMap(Map<String, dynamic> map) {
+    return SignUp(
+      sessionId: map['session_id'] as String,
+      password: map['password'] as String,
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory SignUp.fromJson(String source) =>
+      SignUp.fromMap(json.decode(source) as Map<String, dynamic>);
+
+  @override
+  String toString() => 'SignUp(sessionId: $sessionId, password: $password)';
+}
+
+class TokenSuccess {
+  final String accessToken;
+  final String refreshToken;
+  final Account account;
+  TokenSuccess({
+    required this.accessToken,
+    required this.refreshToken,
+    required this.account,
+  });
+
+  TokenSuccess copyWith({
+    String? accessToken,
+    String? refreshToken,
+    Account? account,
+  }) {
+    return TokenSuccess(
+      accessToken: accessToken ?? this.accessToken,
+      refreshToken: refreshToken ?? this.refreshToken,
+      account: account ?? this.account,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'access_token': accessToken,
+      'refresh_token': refreshToken,
+      'account': account.toMap(),
+    };
+  }
+
+  factory TokenSuccess.fromMap(Map<String, dynamic> map) {
+    return TokenSuccess(
+      accessToken: map['access_token'] as String,
+      refreshToken: map['refresh_token'] as String,
+      account: Account.fromMap(map['account'] as Map<String, dynamic>),
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory TokenSuccess.fromJson(String source) =>
+      TokenSuccess.fromMap(json.decode(source) as Map<String, dynamic>);
+
+  @override
+  String toString() =>
+      'TokenSuccess(accessToken: $accessToken, refreshToken: $refreshToken, account: $account)';
+}
+
+class Login {
+  final String email;
+  final String password;
+  Login({
+    required this.email,
+    required this.password,
+  });
+
+  Login copyWith({
+    String? email,
+    String? password,
+  }) {
+    return Login(
+      email: email ?? this.email,
+      password: password ?? this.password,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return <String, dynamic>{
+      'email': email,
+      'password': password,
+    };
+  }
+
+  factory Login.fromMap(Map<String, dynamic> map) {
+    return Login(
+      email: map['email'] as String,
+      password: map['password'] as String,
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory Login.fromJson(String source) =>
+      Login.fromMap(json.decode(source) as Map<String, dynamic>);
+
+  @override
+  String toString() => 'Login(email: $email, password: $password)';
+}
+
+class FastAPI {
+  final String baseUrl;
+  final RefreshTokenClient client;
+  final int apiVersion;
+
+  FastAPI({
+    this.baseUrl = 'localhost:80',
+    RefreshTokenClient? client,
+    this.apiVersion = 1,
+  }) : client = client ??
+            RefreshTokenClient(
+              authorizationEndpoint: '',
+              tokenEndpoint: '',
+              accessTokenParser: (body) => body['access_token']! as String,
+              refreshTokenParser: (body) => body['refresh_token']! as String,
+              inner: RestClient(
+                protocol: Protocols.http,
+                authority: baseUrl,
+              ),
+            );
+
+  String get apiPath => '/api/v$apiVersion';
+
+  Future<void> sendSignUpCode(String email) async {
+    final r = await client.post(
+      Uri.parse('$apiPath/auth/send-sign-up-code'),
+      body: <String, String>{
+        'email': email,
+      },
+    );
+    if (r.statusCode != 201) {
+      throw Exception('Invalid reponse: ${r.statusCode}');
+    }
+  }
+
+  Future<Account> verifyCode(VerifyCode verifyCode) async {
+    final r = await client.post(
+      Uri.parse('$apiPath/auth/verify-code'),
+      body: verifyCode.toMap(),
+    );
+    if (r.statusCode != 202) {
+      throw Exception('Invalid reponse: ${r.statusCode}');
+    } else {
+      return Account.fromMap(
+        (jsonDecode(r.body) as Map<String, dynamic>)['account']
+            as Map<String, dynamic>,
+      );
+    }
+  }
+
+  Future<Account> signUp(SignUp signUp) async {
+    final r = await client.post(
+      Uri.parse('$apiPath/auth/sign-up'),
+      body: signUp.toMap(),
+    );
+    if (r.statusCode != 201) {
+      throw Exception('Invalid reponse: ${r.statusCode}');
+    } else {
+      return Account.fromJson(r.body);
+    }
+  }
+
+  Future<TokenSuccess> signInWithPassword(Login login) async {
+    final r = await client.authorize(login.toMap());
+    return TokenSuccess.fromJson(r.body);
+  }
+
+  Future<TokenSuccess> refresh() async {
+    final r = await client.refresh();
+    return TokenSuccess.fromJson(r?.body ?? '');
+  }
+
+  Future<List<Account>> getAccountList() async {
+    final r = await client.get(
+      Uri.parse('$apiPath/account'),
+    );
+    if (r.statusCode != 200) {
+      throw Exception('Invalid reponse: ${r.statusCode}');
+    } else {
+      final list = (jsonDecode(r.body) as Map<String, dynamic>)['founds']
+          as List<Map<String, dynamic>>;
+      final result = <Account>[];
+      for (final element in list) {
+        result.add(Account.fromMap(element));
+      }
+      return result;
+    }
+  }
+}
+
+void main(List<String> args) async {
+  final api = FastAPI(
+    client: RefreshTokenClient(
+      authorizationEndpoint: '/api/v1/auth/sign-in-with-password',
+      tokenEndpoint: '/api/v1/auth/refresh',
+      accessTokenParser: (body) => body['access_token']! as String,
+      refreshTokenParser: (body) => body['refresh_token']! as String,
+      inner: RestClient(
+        protocol: Protocols.http,
+        authority: 'localhost:80',
+      ),
+    ),
+  );
+
+  // await api.sendSignUpCode('git@pcl.ovh');
+  // final verifiedAccount = await api.verifyCode(
+  //   VerifyCode(
+  //     email: 'git@pcl.ovh',
+  //     verificationCode: '000000000',
+  //     action: EmailVerificationAction.signUp,
+  //   ),
+  // );
+  // print(verifiedAccount);
+  // final registeredAccount = await api.signUp(
+  //   SignUp(sessionId: verifiedAccount.sessionId ?? '', password: 'password'),
+  // );
+  // print(registeredAccount);
+  final signedInAccount = await api.signInWithPassword(
+    Login(email: 'git@pcl.ovh', password: 'password'),
+  );
+  // print(signedInAccount);
+  final accountList = await api.getAccountList();
+  print(accountList);
+}
diff --git a/packages/wyatt_http_client/example/http_client_test.dart b/packages/wyatt_http_client/example/http_client_test.dart
new file mode 100644
index 00000000..36a66c15
--- /dev/null
+++ b/packages/wyatt_http_client/example/http_client_test.dart
@@ -0,0 +1,41 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+
+Future<void> main(List<String> args) async {
+  // final client = Oauth2Client(
+  //   accessToken: 'test-token',
+  //   inner: RestClient(protocol: Protocols.http, authority: 'localhost:80'),
+  // );
+  // final client = RestClient(
+  //   protocol: Protocols.http,
+  //   authority: 'localhost:80',
+  //   inner: Oauth2Client(
+  //     authorizationEndpoint: '/api/v1/account/test',
+  //     tokenEndpoint: '/api/v1/account/test',
+  //     accessToken: 'test-token',
+  //     refreshToken: 'refresh-token',
+  //   ),
+  // );
+  // final client = RestClient(protocol: Protocols.http, authority: 'localhost:80');
+  // final client =AwesomeRestClient(protocol: Protocols.http, authority: 'localhost:80');
+  // var r = await client.post(
+  //   Uri.parse('/api/v1/account/test'),
+  //   body: <String, String>{
+  //     'email': 'test@test.fr',
+  //   },
+  // );
+}
diff --git a/packages/wyatt_http_client/lib/src/authentication/interfaces/authenticated_client.dart b/packages/wyatt_http_client/lib/src/authentication/interfaces/authenticated_client.dart
new file mode 100644
index 00000000..0c8cc7f1
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/authentication/interfaces/authenticated_client.dart
@@ -0,0 +1,87 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:http/http.dart';
+import 'package:wyatt_http_client/src/implemented_base_client.dart';
+
+abstract class AuthenticatedClient implements ImplementedBaseClient {
+  final Client _inner;
+
+  AuthenticatedClient({
+    Client? inner,
+  }) : _inner = inner ?? Client();
+
+  @override
+  void close() => _inner.close();
+
+  @override
+  Future<Response> head(Uri url, {Map<String, String>? headers}) =>
+      _inner.head(url, headers: headers);
+
+  @override
+  Future<Response> get(Uri url, {Map<String, String>? headers}) =>
+      _inner.get(url, headers: headers);
+
+  @override
+  Future<Response> post(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.post(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> put(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.put(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> patch(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.patch(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> delete(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.delete(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<String> read(Uri url, {Map<String, String>? headers}) =>
+      _inner.read(url, headers: headers);
+
+  @override
+  Future<Uint8List> readBytes(Uri url, {Map<String, String>? headers}) =>
+      _inner.readBytes(url, headers: headers);
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) => _inner.send(request);
+}
diff --git a/packages/wyatt_http_client/lib/src/authentication/interfaces/authentication_client.dart b/packages/wyatt_http_client/lib/src/authentication/interfaces/authentication_client.dart
index 9e956216..94c844d4 100644
--- a/packages/wyatt_http_client/lib/src/authentication/interfaces/authentication_client.dart
+++ b/packages/wyatt_http_client/lib/src/authentication/interfaces/authentication_client.dart
@@ -14,8 +14,161 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+import 'dart:convert';
+import 'dart:typed_data';
+
 import 'package:http/http.dart';
+import 'package:wyatt_http_client/src/mixins/body_transformer.dart';
+import 'package:wyatt_http_client/src/mixins/headers_transformer.dart';
 import 'package:wyatt_http_client/src/rest_client.dart';
+import 'package:wyatt_http_client/src/utils/protocols.dart';
+import 'package:wyatt_http_client/src/utils/utils.dart';
+
+class AwesomeClient extends BaseClient {
+  final Client _inner;
+
+  AwesomeClient({
+    Client? inner,
+  }) : _inner = inner ?? Client();
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) {
+    return _inner.send(request);
+  }
+}
+
+class AwesomeRestClient extends AwesomeClient
+    with HeadersTransformer, BodyTransformer {
+  final Protocols protocol;
+  final String? authority;
+
+  AwesomeRestClient({
+    this.protocol = Protocols.https,
+    this.authority = '',
+    super.inner,
+  });
+
+  @override
+  Object? bodyMutator(Object? body) {
+    print('bodyMutator: Json encoding');
+    return jsonEncode(body);
+  }
+
+  @override
+  Map<String, String>? headersMutator(
+    Object? body,
+    Map<String, String>? headers,
+  ) {
+    print('headerMutator: Json encoding');
+    final mutation = {
+      'content-type': 'application/json; charset=utf-8',
+    };
+    if (headers != null) {
+      headers.addAll(mutation);
+      return headers;
+    } else {
+      return mutation;
+    }
+  }
+
+  @override
+  BaseRequest requestMutator(BaseRequest request) {
+    print('requestMutator: scheme + authority');
+    final Uri uri = Uri.parse('${protocol.scheme}$authority${request.url}');
+    return Utils.copyRequestWith(request, url: uri);
+  }
+}
+
+class AwesomeUrlClient extends AuthenticatedClient {
+  AwesomeUrlClient(super.inner);
+}
+
+class AwesomeOauth2Client extends AuthenticatedClient with HeadersTransformer {
+  AwesomeOauth2Client(super.inner);
+
+  @override
+  Map<String, String>? headersMutator(
+    Object? body,
+    Map<String, String>? headers,
+  ) {
+    print('headersMutator: Token manager');
+    final mutation = {
+      'authorization': 'Bearer TOKEN',
+    };
+    if (headers != null) {
+      headers.addAll(mutation);
+      return headers;
+    } else {
+      return mutation;
+    }
+  }
+}
+
+abstract class AuthenticatedClient implements Client {
+  final Client _inner;
+
+  Client get inner => _inner;
+
+  AuthenticatedClient(BaseClient? inner) : _inner = inner ?? RestClient();
+
+  @override
+  void close() => _inner.close();
+
+  @override
+  Future<Response> head(Uri url, {Map<String, String>? headers}) =>
+      _inner.head(url, headers: headers);
+
+  @override
+  Future<Response> get(Uri url, {Map<String, String>? headers}) =>
+      _inner.get(url, headers: headers);
+
+  @override
+  Future<Response> post(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.post(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> put(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.put(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> patch(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.patch(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> delete(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.delete(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<String> read(Uri url, {Map<String, String>? headers}) =>
+      _inner.read(url, headers: headers);
+
+  @override
+  Future<Uint8List> readBytes(Uri url, {Map<String, String>? headers}) =>
+      _inner.readBytes(url, headers: headers);
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) => _inner.send(request);
+}
 
 abstract class AuthenticationClient extends BaseClient {
   final BaseClient _inner;
@@ -24,6 +177,50 @@ abstract class AuthenticationClient extends BaseClient {
 
   AuthenticationClient(BaseClient? inner) : _inner = inner ?? RestClient();
 
+  @override
+  Future<Response> head(Uri url, {Map<String, String>? headers}) =>
+      _inner.head(url, headers: headers);
+
+  @override
+  Future<Response> get(Uri url, {Map<String, String>? headers}) =>
+      _inner.get(url, headers: headers);
+
+  @override
+  Future<Response> post(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.post(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> put(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.put(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> patch(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.patch(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> delete(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.delete(url, headers: headers, body: body, encoding: encoding);
+
   @override
   Future<StreamedResponse> send(BaseRequest request) {
     return _inner.send(request);
diff --git a/packages/wyatt_http_client/lib/src/authentication/interfaces/header_authentication_client.dart b/packages/wyatt_http_client/lib/src/authentication/interfaces/header_authentication_client.dart
index c206748f..ef8aae8d 100644
--- a/packages/wyatt_http_client/lib/src/authentication/interfaces/header_authentication_client.dart
+++ b/packages/wyatt_http_client/lib/src/authentication/interfaces/header_authentication_client.dart
@@ -31,6 +31,7 @@ abstract class HeaderAuthenticationClient extends AuthenticationClient {
     final newHeader = modifyHeader(Map.from(request.headers), request);
     request.headers.clear();
     request.headers.addAll(newHeader);
+    print(newHeader);
     return super.send(request);
   }
 }
diff --git a/packages/wyatt_http_client/lib/src/authentication/interfaces/oauth2_client.dart b/packages/wyatt_http_client/lib/src/authentication/interfaces/oauth2_client.dart
index 1da70e99..5704788c 100644
--- a/packages/wyatt_http_client/lib/src/authentication/interfaces/oauth2_client.dart
+++ b/packages/wyatt_http_client/lib/src/authentication/interfaces/oauth2_client.dart
@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+import 'package:http/http.dart';
 import 'package:wyatt_http_client/src/authentication/interfaces/header_authentication_client.dart';
 
 typedef TokenParser = String Function(Map<String, dynamic>);
@@ -21,14 +22,14 @@ typedef TokenParser = String Function(Map<String, dynamic>);
 abstract class Oauth2Client extends HeaderAuthenticationClient {
   Oauth2Client(super.inner);
 
-  Future<void> refresh() {
+  Future<Response?> refresh() {
     return Future.value();
   }
 
-  Future<void> authorize(
+  Future<Response> authorize(
     Map<String, dynamic> body, {
     Map<String, String>? headers,
   }) {
-    return Future.value();
+    return Future<Response>.value();
   }
 }
diff --git a/packages/wyatt_http_client/lib/src/authentication/refresh_token_client.dart b/packages/wyatt_http_client/lib/src/authentication/refresh_token_client.dart
index 67d6a1d0..01201966 100644
--- a/packages/wyatt_http_client/lib/src/authentication/refresh_token_client.dart
+++ b/packages/wyatt_http_client/lib/src/authentication/refresh_token_client.dart
@@ -23,6 +23,78 @@ import 'package:wyatt_http_client/src/utils/header_keys.dart';
 import 'package:wyatt_http_client/src/utils/http_status.dart';
 import 'package:wyatt_http_client/src/utils/utils.dart';
 
+// class Oauth2Client extends ImplementedBaseClient with RequestTransformer {
+//   final String authorizationEndpoint;
+//   final String tokenEndpoint;
+//   String? accessToken;
+//   String? refreshToken;
+//   String? tokenToUse;
+
+//   Oauth2Client({
+//     required this.authorizationEndpoint,
+//     required this.tokenEndpoint,
+//     this.accessToken,
+//     this.refreshToken,
+//     super.inner,
+//   }) : tokenToUse = accessToken;
+
+//   @override
+//   BaseRequest requestMutator(BaseRequest request) {
+//     print('Oauth2Client::requestMutator -> add authorization: $accessToken');
+//     final headers = request.headers;
+//     final mutation = {
+//       'Authorization': 'Bearer $tokenToUse',
+//     };
+//     if (tokenToUse?.isNotEmpty ?? false) {
+//       headers.addAll(mutation);
+//       return Utils.copyRequestWith(request, headers: headers);
+//     }
+//     return request;
+//   }
+
+//   Future<Response?> refresh() async {
+//     if (refreshToken?.isNotEmpty ?? false) {
+//       tokenToUse = refreshToken;
+
+//       final response = await get(
+//         Uri.parse(tokenEndpoint),
+//       );
+
+//       if (response.statusCode == HttpStatus.ok) {
+//         // final body = json.decode(response.body) as Map<String, dynamic>;
+//         // accessToken = accessTokenParser(body);
+//         print('Oauth2Client::refresh -> ok');
+//       }
+//       return response;
+//     }
+//     return null;
+//   }
+
+// @override
+// Map<String, String>? headersMutator(
+//   Object? body,
+//   Map<String, String>? headers,
+// ) {
+//   print(
+//     'Oauth2Client::headersMutator -> add authorization: $accessToken',
+//   );
+//   final mutation = {
+//     'Authorization': 'Bearer $accessToken',
+//   };
+//   if (accessToken.isNotEmpty) {
+//     if (headers != null) {
+//       headers.addAll(mutation);
+//       return headers;
+//     } else {
+//       return mutation;
+//     }
+//   } else {
+//     return headers;
+//   }
+// }
+
+// }
+
 class RefreshTokenClient extends Oauth2Client {
   final String authorizationEndpoint;
   final String tokenEndpoint;
@@ -50,6 +122,8 @@ class RefreshTokenClient extends Oauth2Client {
     Map<String, String> header, [
     BaseRequest? request,
   ]) {
+    print('accessToken $accessToken');
+    print('request $request');
     if (accessToken != null && request != null) {
       header[authenticationHeader] = '$authenticationMethod $accessToken';
       return header;
@@ -58,13 +132,13 @@ class RefreshTokenClient extends Oauth2Client {
   }
 
   @override
-  Future<void> authorize(
+  Future<Response> authorize(
     Map<String, dynamic> body, {
     Map<String, String>? headers,
   }) async {
     final response = await inner.post(
       Uri.parse(authorizationEndpoint),
-      body: jsonEncode(body),
+      body: body,
       headers: headers,
     );
 
@@ -80,10 +154,11 @@ class RefreshTokenClient extends Oauth2Client {
         this.refreshToken = refreshToken;
       }
     }
+    return response;
   }
 
   @override
-  Future<void> refresh() async {
+  Future<Response?> refresh() async {
     if (refreshToken != null) {
       final Map<String, String> header = {
         authenticationHeader: '$authenticationHeader $refreshToken',
@@ -98,11 +173,16 @@ class RefreshTokenClient extends Oauth2Client {
         final body = json.decode(response.body) as Map<String, dynamic>;
         accessToken = accessTokenParser(body);
       }
+      return response;
     }
+    return null;
   }
 
   @override
   Future<StreamedResponse> send(BaseRequest request) async {
+    final newHeader = modifyHeader(Map.from(request.headers), request);
+    request.headers.clear();
+    request.headers.addAll(newHeader);
     final response = await super.send(request);
 
     if (response.statusCode == HttpStatus.unauthorized) {
diff --git a/packages/wyatt_http_client/lib/src/implemented_base_client.dart b/packages/wyatt_http_client/lib/src/implemented_base_client.dart
new file mode 100644
index 00000000..e42ed84f
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/implemented_base_client.dart
@@ -0,0 +1,31 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:http/http.dart';
+
+class ImplementedBaseClient extends BaseClient {
+  final Client inner;
+
+  ImplementedBaseClient({
+    Client? inner,
+  }) : inner = inner ?? Client();
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) {
+    return inner.send(request);
+  }
+
+}
diff --git a/packages/wyatt_http_client/lib/src/implemented_client.dart b/packages/wyatt_http_client/lib/src/implemented_client.dart
new file mode 100644
index 00000000..a9790c33
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/implemented_client.dart
@@ -0,0 +1,86 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:http/http.dart';
+
+abstract class ImplementedClient extends BaseClient {
+  final Client _inner;
+
+  ImplementedClient({
+    Client? inner,
+  }) : _inner = inner ?? Client();
+
+  @override
+  void close() => _inner.close();
+
+  @override
+  Future<Response> head(Uri url, {Map<String, String>? headers}) =>
+      _inner.head(url, headers: headers);
+
+  @override
+  Future<Response> get(Uri url, {Map<String, String>? headers}) =>
+      _inner.get(url, headers: headers);
+
+  @override
+  Future<Response> post(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.post(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> put(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.put(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> patch(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.patch(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<Response> delete(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) =>
+      _inner.delete(url, headers: headers, body: body, encoding: encoding);
+
+  @override
+  Future<String> read(Uri url, {Map<String, String>? headers}) =>
+      _inner.read(url, headers: headers);
+
+  @override
+  Future<Uint8List> readBytes(Uri url, {Map<String, String>? headers}) =>
+      _inner.readBytes(url, headers: headers);
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) => _inner.send(request);
+}
diff --git a/packages/wyatt_http_client/lib/src/mixins/body_transformer.dart b/packages/wyatt_http_client/lib/src/mixins/body_transformer.dart
new file mode 100644
index 00000000..b5931d48
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/mixins/body_transformer.dart
@@ -0,0 +1,83 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'dart:convert';
+
+import 'package:http/http.dart';
+
+mixin BodyTransformer on Client {
+  Object? bodyMutator(Object? body);
+
+  @override
+  Future<Response> post(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.post(
+      url,
+      headers: headers,
+      body: bodyMutator(body),
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<Response> put(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.put(
+      url,
+      headers: headers,
+      body: bodyMutator(body),
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<Response> patch(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.patch(
+      url,
+      headers: headers,
+      body: bodyMutator(body),
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<Response> delete(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.delete(
+      url,
+      headers: headers,
+      body: bodyMutator(body),
+      encoding: encoding,
+    );
+  }
+}
diff --git a/packages/wyatt_http_client/lib/src/mixins/headers_transformer.dart b/packages/wyatt_http_client/lib/src/mixins/headers_transformer.dart
new file mode 100644
index 00000000..42cc270b
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/mixins/headers_transformer.dart
@@ -0,0 +1,131 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:http/http.dart';
+
+mixin HeadersTransformer on Client {
+  Map<String, String>? headersMutator(
+    Object? body,
+    Map<String, String>? headers,
+  );
+
+  @override
+  Future<Response> head(
+    Uri url, {
+    Map<String, String>? headers,
+  }) {
+    return super.head(
+      url,
+      headers: headersMutator(null, headers),
+    );
+  }
+
+  @override
+  Future<Response> get(
+    Uri url, {
+    Map<String, String>? headers,
+  }) {
+    return super.get(
+      url,
+      headers: headersMutator(null, headers),
+    );
+  }
+
+  @override
+  Future<Response> post(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.post(
+      url,
+      headers: headersMutator(body, headers),
+      body: body,
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<Response> put(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.put(
+      url,
+      headers: headersMutator(body, headers),
+      body: body,
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<Response> patch(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.patch(
+      url,
+      headers: headersMutator(body, headers),
+      body: body,
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<Response> delete(
+    Uri url, {
+    Map<String, String>? headers,
+    Object? body,
+    Encoding? encoding,
+  }) {
+    return super.delete(
+      url,
+      headers: headersMutator(body, headers),
+      body: body,
+      encoding: encoding,
+    );
+  }
+
+  @override
+  Future<String> read(
+    Uri url, {
+    Map<String, String>? headers,
+  }) {
+    return super.read(
+      url,
+      headers: headersMutator(null, headers),
+    );
+  }
+
+  @override
+  Future<Uint8List> readBytes(
+    Uri url, {
+    Map<String, String>? headers,
+  }) {
+    return super.readBytes(
+      url,
+      headers: headersMutator(null, headers),
+    );
+  }
+}
diff --git a/packages/wyatt_http_client/lib/src/mixins/oauth2_transformer.dart b/packages/wyatt_http_client/lib/src/mixins/oauth2_transformer.dart
new file mode 100644
index 00000000..a1abf27a
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/mixins/oauth2_transformer.dart
@@ -0,0 +1,33 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:http/http.dart';
+import 'package:wyatt_http_client/src/implemented_base_client.dart';
+
+mixin Oauth2Transformer on ImplementedBaseClient {
+  late final String authorizationEndpoint;
+  late final String tokenEndpoint;
+  String? accessToken;
+  String? refreshToken;
+
+  BaseRequest requestAuthenticator(BaseRequest request);
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) {
+    final req = requestAuthenticator(request);
+    return super.send(req);
+  }
+}
diff --git a/packages/wyatt_http_client/lib/src/mixins/request_transformer.dart b/packages/wyatt_http_client/lib/src/mixins/request_transformer.dart
new file mode 100644
index 00000000..24db0982
--- /dev/null
+++ b/packages/wyatt_http_client/lib/src/mixins/request_transformer.dart
@@ -0,0 +1,27 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:http/http.dart';
+import 'package:wyatt_http_client/src/implemented_base_client.dart';
+
+mixin RequestTransformer on ImplementedBaseClient {
+  BaseRequest requestMutator(BaseRequest request);
+
+  @override
+  Future<StreamedResponse> send(BaseRequest request) {
+    return super.send(requestMutator(request));
+  }
+}
diff --git a/packages/wyatt_http_client/lib/src/rest_client.dart b/packages/wyatt_http_client/lib/src/rest_client.dart
index cde6f3d6..1925eef1 100644
--- a/packages/wyatt_http_client/lib/src/rest_client.dart
+++ b/packages/wyatt_http_client/lib/src/rest_client.dart
@@ -14,25 +14,177 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
+import 'dart:convert';
+
 import 'package:http/http.dart';
+import 'package:wyatt_http_client/src/implemented_base_client.dart';
+import 'package:wyatt_http_client/src/mixins/body_transformer.dart';
+import 'package:wyatt_http_client/src/mixins/headers_transformer.dart';
+import 'package:wyatt_http_client/src/mixins/request_transformer.dart';
 import 'package:wyatt_http_client/src/utils/protocols.dart';
 import 'package:wyatt_http_client/src/utils/utils.dart';
 
-class RestClient extends BaseClient {
+class RestClient extends ImplementedBaseClient
+    with BodyTransformer, HeadersTransformer, RequestTransformer {
   final Protocols protocol;
   final String? authority;
 
-  final Client _inner;
-
   RestClient({
     this.protocol = Protocols.https,
     this.authority = '',
-    Client? inner,
-  }) : _inner = inner ?? Client();
+    super.inner,
+  });
 
   @override
-  Future<StreamedResponse> send(BaseRequest request) {
+  Object? bodyMutator(Object? body) {
+    print(
+      'RestClient::bodyMutator -> encode in json if body is Map: ${body is Map}',
+    );
+    if (body is Map) {
+      return jsonEncode(body);
+    }
+    return body;
+  }
+
+  @override
+  Map<String, String>? headersMutator(
+    Object? body,
+    Map<String, String>? headers,
+  ) {
+    print(
+      'RestClient::headersMutator -> add json content-type if body is Map: ${body is Map}',
+    );
+    final mutation = {
+      'content-type': 'application/json; charset=utf-8',
+    };
+    if (body is Map) {
+      if (headers != null) {
+        headers.addAll(mutation);
+        return headers;
+      } else {
+        return mutation;
+      }
+    }
+    return headers;
+  }
+
+  @override
+  BaseRequest requestMutator(BaseRequest request) {
+    print(
+      'RestClient::requestMutator -> add prefix path: ${protocol.scheme}$authority',
+    );
     final Uri uri = Uri.parse('${protocol.scheme}$authority${request.url}');
-    return _inner.send(Utils.copyRequestWith(request, url: uri));
+    return Utils.copyRequestWith(request, url: uri);
   }
 }
+
+// class RestClient extends BaseClient {
+//   final Protocols protocol;
+//   final String? authority;
+
+//   final Client _inner;
+
+//   RestClient({
+//     this.protocol = Protocols.https,
+//     this.authority = '',
+//     Client? inner,
+//   }) : _inner = inner ?? Client();
+
+//   String? forceJson(Object? body) {
+//     String? b;
+//     if (body != null && body is Map) {
+//       b = jsonEncode(body);
+//     }
+//     return b;
+//   }
+
+//   Map<String, String>? forceJsonHeader(
+//       Object? body, Map<String, String>? headers,) {
+//     final Map<String, String> h = headers ?? {};
+//     if (body != null && body is Map) {
+//       h['Content-Type'] = 'application/json';
+//     }
+//     return h;
+//   }
+
+//   // @override
+//   // Future<Response> post(
+//   //   Uri url, {
+//   //   Map<String, String>? headers,
+//   //   Object? body,
+//   //   Encoding? encoding,
+//   // }) {
+//   //   final b = forceJson(body) ?? body;
+//   //   final h = forceJsonHeader(body, headers) ?? headers;
+//   //   print(b);
+//   //   print(h);
+//   //   return super.post(
+//   //     url,
+//   //     headers: h,
+//   //     body: b,
+//   //     encoding: encoding,
+//   //   );
+//   // }
+
+//   @override
+//   Future<Response> put(
+//     Uri url, {
+//     Map<String, String>? headers,
+//     Object? body,
+//     Encoding? encoding,
+//   }) {
+//     final b = forceJson(body) ?? body;
+//     final h = forceJsonHeader(body, headers) ?? headers;
+//     return super.put(
+//       url,
+//       headers: h,
+//       body: b,
+//       encoding: encoding,
+//     );
+//   }
+
+//   @override
+//   Future<Response> patch(
+//     Uri url, {
+//     Map<String, String>? headers,
+//     Object? body,
+//     Encoding? encoding,
+//   }) {
+//     final b = forceJson(body) ?? body;
+//     final h = forceJsonHeader(body, headers) ?? headers;
+//     return super.patch(
+//       url,
+//       headers: h,
+//       body: b,
+//       encoding: encoding,
+//     );
+//   }
+
+//   @override
+//   Future<Response> delete(
+//     Uri url, {
+//     Map<String, String>? headers,
+//     Object? body,
+//     Encoding? encoding,
+//   }) {
+//     final b = forceJson(body) ?? body;
+//     final h = forceJsonHeader(body, headers) ?? headers;
+//     return super.delete(
+//       url,
+//       headers: h,
+//       body: b,
+//       encoding: encoding,
+//     );
+//   }
+
+//   @override
+//   Future<StreamedResponse> send(BaseRequest request) {
+//     final Uri uri = Uri.parse('${protocol.scheme}$authority${request.url}');
+//     return _inner.send(
+//       Utils.copyRequestWith(
+//         request,
+//         url: uri,
+//       ),
+//     );
+//   }
+// }