Что такое клиент-серверная архитектура?

Client-server architecture is a paradigm of interaction between components of a distributed application, where one component (client) requests services from another component (server).

Key principles:

Separation of roles: Clear division of request functions (client) and resource or service provision (server).
Asynchrony: The client sends a request and can continue its work without waiting for an immediate response from the server.
Scalability: Servers can serve many clients simultaneously.

Types of clients:

Web browsers
Mobile applications
Desktop applications
Other servers (in multi-tier systems)

Types of servers:

Database servers
Web servers
Mail servers
File servers

Interaction example (HTTP):

# Client (browser) sends a GET request
# GET /index.html HTTP/1.1
# Host: www.example.com

# Server (web server) processes the request and returns a response
# HTTP/1.1 200 OK
# Content-Type: text/html
#
# <html><body>...</body></html>

Advantages:

Centralized management: Resources and data are on the server, simplifying administration and backup.
Enhanced security: The server can control access to data and resources.
Easier maintenance: Updates and fixes are made only on the server, simplifying the distribution of changes.
High performance: The server can utilize powerful computational resources to handle requests.

Disadvantages:

Dependence on the server: Server failure leads to service unavailability for clients.
Server load: A large number of clients can overload the server.
Implementation complexity: Developing distributed systems can be more complex than monolithic ones.

Examples of implementation in Python:

Using frameworks like Flask or Django to create web servers.
Using requests libraries to create clients that send requests.
Using sockets for low-level interaction.