diff --git a/tsukanova_irina_lab_3/author_service/author_service.py b/tsukanova_irina_lab_3/author_service/author_service.py
index a475a84..1269b38 100644
--- a/tsukanova_irina_lab_3/author_service/author_service.py
+++ b/tsukanova_irina_lab_3/author_service/author_service.py
@@ -37,7 +37,6 @@ authors: list[Author] = [
     Author(name='Tess', surname='Root', uuid_='eb815350-c7b9-4446-8434-4c0640c21995')
 ]
 
-
 books_url = 'http://localhost:5001/'
 
 
@@ -45,11 +44,13 @@ def list_jsonify():
     return jsonify([author.to_dict() for author in authors])
 
 
+# получение списка всех авторов
 @app.route('/', methods=['GET'])
 def get_all():
     return list_jsonify(), 200
 
 
+# получение автора по идентификатору
 @app.route('/<uuid:uuid_>', methods=['GET'])
 def get_one(uuid_):
     for author in authors:
@@ -59,6 +60,7 @@ def get_one(uuid_):
     return 'Автор с таким uuid не был найден', 404
 
 
+# получение автора со списком его книг
 @app.route('/with-books/<uuid:uuid_>', methods=['GET'])
 def get_one_with_books(uuid_):
     for author in authors:
@@ -70,19 +72,30 @@ def get_one_with_books(uuid_):
     return 'Автор с таким uuid не был найден', 404
 
 
+# проверка наличия автора по его идентификатору (для book_service)
+@app.route('/check/<uuid:uuid_>', methods=['GET'])
+def check_exist(uuid_):
+    for author in authors:
+        if author.uuid_ == uuid_:
+            return '', 200
+    return '', 404
+
+
+# создание автора
 @app.route('/', methods=['POST'])
 def create():
     data = request.json
     name = data.get('name', None)
     surname = data.get('surname', None)
-    # if name is None or surname is None:
-    #     return 'Недостаточно полей для создания нового автора', 404
+    if name is None or surname is None:
+        return 'Недостаточно полей для создания нового автора', 404
 
     new_author = Author(name, surname, None)
     authors.append(new_author)
     return get_one(new_author.uuid_)
 
 
+# изменение автора по идентификатору
 @app.route('/<uuid:uuid_>', methods=['PUT'])
 def update_by_id(uuid_):
     data = request.json
@@ -100,15 +113,16 @@ def update_by_id(uuid_):
     return 'Автор с таким uuid не был найден', 404
 
 
+# удаление автора по идентификатору
 @app.route('/<uuid:uuid_>', methods=['DELETE'])
 def delete(uuid_):
     for author in authors:
         if author.uuid_ == uuid_:
             authors.remove(author)
-            return '', 200
+            return 'Автор успешно удален', 200
 
     return 'Автор с таким uuid не был найден', 404
 
 
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', port=5000, debug=True)
+    app.run(host='0.0.0.0', port=20001, debug=True)
diff --git a/tsukanova_irina_lab_3/author_service/requirements.txt b/tsukanova_irina_lab_3/author_service/requirements.txt
index 404c0b6..bbbb04b 100644
Binary files a/tsukanova_irina_lab_3/author_service/requirements.txt and b/tsukanova_irina_lab_3/author_service/requirements.txt differ
diff --git a/tsukanova_irina_lab_3/book_service/book_service.py b/tsukanova_irina_lab_3/book_service/book_service.py
index 624a6df..67b75ba 100644
--- a/tsukanova_irina_lab_3/book_service/book_service.py
+++ b/tsukanova_irina_lab_3/book_service/book_service.py
@@ -4,23 +4,6 @@ from uuid import uuid4
 import uuid
 
 
-class Author:
-    def __init__(self, name, surname, uuid_: uuid):
-        if uuid_ is None:
-            self.uuid_: uuid = uuid4()
-        else:
-            self.uuid_: uuid = uuid.UUID(uuid_)
-        self.name: str = name
-        self.surname: str = surname
-
-    def to_dict(self):
-        return {
-            "uuid": self.uuid_,
-            "name": self.name,
-            "surname": self.surname
-        }
-
-
 class Book:
     def __init__(self, title, year, uuid_: uuid, author_id: uuid):
         if uuid_ is None:
@@ -59,15 +42,20 @@ class Book:
 app = Flask(__name__)
 
 books: list[Book] = [
-    Book(title='Garden', year=1977, uuid_='89fa1e7a-7e88-445e-a4d8-6d4497ea8f19', author_id='997aa4c5-ebb2-4794-ba81-e742f9f1fa30'),
-    Book(title='New York', year=1989, uuid_='0351ee11-f11b-4d83-b2c8-1075b0c357dc', author_id='694827e4-0f93-45a5-8f75-bad7ef2d21fe'),
-    Book(title='The story of flowers', uuid_='dfc17619-7690-47aa-ae8e-6a5068f8ddec', year=1977, author_id='eb815350-c7b9-4446-8434-4c0640c21995'),
-    Book(title='Little Rock', year=1990, uuid_='3fad0e6b-cefc-40dd-99c0-adc5ec0290d2', author_id='694827e4-0f93-45a5-8f75-bad7ef2d21fe'),
-    Book(title='One Piece', year=1994, uuid_='cf0cf26e-c1c6-43ea-bf59-1f8edb180e41', author_id='694827e4-0f93-45a5-8f75-bad7ef2d21fe'),
-    Book(title='Black clover', year=1940, uuid_='2ac3c734-21ad-4450-884d-7de1f5452b9d', author_id='eb815350-c7b9-4446-8434-4c0640c21995'),
+    Book(title='Garden', year=1977, uuid_='89fa1e7a-7e88-445e-a4d8-6d4497ea8f19',
+         author_id='997aa4c5-ebb2-4794-ba81-e742f9f1fa30'),
+    Book(title='New York', year=1989, uuid_='0351ee11-f11b-4d83-b2c8-1075b0c357dc',
+         author_id='694827e4-0f93-45a5-8f75-bad7ef2d21fe'),
+    Book(title='The story of flowers', uuid_='dfc17619-7690-47aa-ae8e-6a5068f8ddec', year=1977,
+         author_id='eb815350-c7b9-4446-8434-4c0640c21995'),
+    Book(title='Little Rock', year=1990, uuid_='3fad0e6b-cefc-40dd-99c0-adc5ec0290d2',
+         author_id='694827e4-0f93-45a5-8f75-bad7ef2d21fe'),
+    Book(title='One Piece', year=1994, uuid_='cf0cf26e-c1c6-43ea-bf59-1f8edb180e41',
+         author_id='694827e4-0f93-45a5-8f75-bad7ef2d21fe'),
+    Book(title='Black clover', year=1940, uuid_='2ac3c734-21ad-4450-884d-7de1f5452b9d',
+         author_id='eb815350-c7b9-4446-8434-4c0640c21995'),
 ]
 
-
 authors_url = 'http://localhost:5000/'
 
 
@@ -75,11 +63,13 @@ def list_jsonify():
     return jsonify([book.to_dict() for book in books])
 
 
+# получить список книг без подробной инфы об авторе
 @app.route('/', methods=['GET'])
 def get_all():
     return list_jsonify(), 200
 
 
+# получение всех книг с информацией об авторе
 @app.route('/full', methods=['GET'])
 def get_all_full():
     authors: list[dict] = requests.get(authors_url).json()
@@ -92,11 +82,13 @@ def get_all_full():
     return response, 200
 
 
+# получение списка книг по идентификатору автора (для author_service)
 @app.route('/by-author/<uuid:author_uuid>', methods=['GET'])
 def get_by_author_id(author_uuid):
     return [book.to_dict_for_authors() for book in books if book.author_id == author_uuid], 200
 
 
+# получение книги по идентификатору
 @app.route('/<uuid:uuid_>', methods=['GET'])
 def get_one(uuid_):
     for book in books:
@@ -106,6 +98,7 @@ def get_one(uuid_):
     return 'Книга с таким uuid не была найдена', 404
 
 
+# получение книги по идентификатору с инфой об авторе
 @app.route('/full/<uuid:uuid_>', methods=['GET'])
 def get_one_full(uuid_):
     for book in books:
@@ -116,18 +109,26 @@ def get_one_full(uuid_):
     return 'Книга с таким uuid не была найдена', 404
 
 
+# создание новой книги
 @app.route('/', methods=['POST'])
 def create():
     data = request.json
     title = data.get('title', None)
     year = data.get('year', None)
     author_id = data.get('author_id', None)
+    checking = requests.get(authors_url + f'/check/{author_id}')
+    print(checking)
+    if checking.status_code == 200:
+        new_book = Book(title, year, None, author_id)
+        books.append(new_book)
+        return get_one(new_book.uuid_)
+    if checking.status_code == 404:
+        return 'Автор с таким uuid не существует', 404
 
-    new_book = Book(title, year, None, author_id)
-    books.append(new_book)
-    return get_one(new_book.uuid_)
+    return 'Неизвестная ошибка', 500
 
 
+# изменение книги по идентификатору
 @app.route('/<uuid:uuid_>', methods=['PUT'])
 def update_by_id(uuid_):
     data = request.json
@@ -135,6 +136,8 @@ def update_by_id(uuid_):
     new_year = data.get('year', None)
 
     for book in books:
+        print(book.uuid_)
+
         if book.uuid_ == uuid_:
             if new_title is not None:
                 book.title = new_title
@@ -145,15 +148,16 @@ def update_by_id(uuid_):
     return 'Книга с таким uuid не была найдена', 404
 
 
+# удаление книги по идентификатору
 @app.route('/<uuid:uuid_>', methods=['DELETE'])
 def delete(uuid_):
     for book in books:
         if book.uuid_ == uuid_:
             books.remove(book)
-            return '', 200
+            return 'Книга успешно удалена', 200
 
     return 'Книга с таким uuid не была найдена', 404
 
 
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', port=5001, debug=True)
+    app.run(host='0.0.0.0', port=20002, debug=True)
diff --git a/tsukanova_irina_lab_3/book_service/requirements.txt b/tsukanova_irina_lab_3/book_service/requirements.txt
index 404c0b6..41917d8 100644
Binary files a/tsukanova_irina_lab_3/book_service/requirements.txt and b/tsukanova_irina_lab_3/book_service/requirements.txt differ
diff --git a/tsukanova_irina_lab_3/docker-compose.yaml b/tsukanova_irina_lab_3/docker-compose.yaml
index 58ca660..3e34647 100644
--- a/tsukanova_irina_lab_3/docker-compose.yaml
+++ b/tsukanova_irina_lab_3/docker-compose.yaml
@@ -6,22 +6,22 @@ services:
       context: .
       dockerfile: ./author_service/Dockerfile
     ports:
-      - "20001:5000"
+      - 20001
 
-    book_service:
-      container_name: book_service
-      build:
-        context: .
-        dockerfile: ./book_service/Dockerfile
-      ports:
-        - "20002:5000"
+  book_service:
+    container_name: book_service
+    build:
+      context: .
+      dockerfile: ./book_service/Dockerfile
+    expose:
+      - 20002
 
-    nginx:
-      image: nginx:latest
-      ports:
-        - "80:80"
-      depends_on:
-        - author_service
-        - book_service
-      volumes:
-        - ./nginx/nginx.conf:/etc/nginx/nginx.conf
\ No newline at end of file
+  nginx:
+    image: nginx:latest
+    ports:
+      - "80:80"
+    volumes:
+      - ./nginx/nginx.conf:/etc/nginx/nginx.conf
+    depends_on:
+      - author_service
+      - book_service
\ No newline at end of file
diff --git a/tsukanova_irina_lab_3/nginx/nginx.conf b/tsukanova_irina_lab_3/nginx/nginx.conf
index f6ff7c0..805d451 100644
--- a/tsukanova_irina_lab_3/nginx/nginx.conf
+++ b/tsukanova_irina_lab_3/nginx/nginx.conf
@@ -1,6 +1,10 @@
+
+events { worker_connections 1024; }
+
 http {
     server {
-        listen 80;
+        listen      80;
+        listen      [::]:80;
         server_name localhost;
 
         location /author_service/ {
diff --git a/tsukanova_irina_lab_3/requirements.txt b/tsukanova_irina_lab_3/requirements.txt
new file mode 100644
index 0000000..41917d8
Binary files /dev/null and b/tsukanova_irina_lab_3/requirements.txt differ