linux+应用程序架构图

+------------------------------------------------------+
|                      应用程序层                      |
|  - Web服务器 (Nginx)                                 |
|  - 数据库 (MySQL)                                    |
|  - 后台服务 (Node.js)                                |
+------------------------------------------------------+
|                    应用程序框架层                    |
|  - Spring Boot (Java)                                |
|  - Express.js (Node.js)                              |
|  - Django (Python)                                   |
+------------------------------------------------------+
|                    系统库层                          |
|  - glibc (C标准库)                                   |
|  - OpenSSL (加密库)                                  |
|  - libcurl (网络库)                                  |
+------------------------------------------------------+
|                      内核层                          |
|  - Linux内核 (v5.x)                                  |
+------------------------------------------------------+

const http = require('http');

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello, World!\n');
});

server.listen(3000, '127.0.0.1', () => {
  console.log('Server running at http://127.0.0.1:3000/');
});