Error: socket hang up の解決方法

// クライアント側でのタイムアウト設定例
const axios = require('axios');

axios.get('https://example.com', { timeout: 10000 })
  .then(response => console.log(response.data))
  .catch(error => console.error(error));

// サーバー側の例（Node.js）
const http = require('http');

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Connection': 'keep-alive' });
  res.end('Hello, world!');
});

server.listen(3000, () => console.log('Server is running on port 3000'));

// クライアント側リクエスト例
const https = require('https');

const options = {
  hostname: 'example.com',
  port: 443,
  path: '/api',
  method: 'GET',
  headers: {
    'Content-Type': 'application/json',
  },
};

const req = https.request(options, res => {
  res.on('data', d => process.stdout.write(d));
});

req.on('error', error => console.error(error));
req.end();

// サーバー側（ExpressでのCORS設定）
const express = require('express');
const cors = require('cors');
const app = express();

app.use(cors());

app.get('/', (req, res) => res.send('CORS enabled!'));
app.listen(3000);

// 再接続処理例
const retryRequest = (url, retries = 3) => {
  const fetch = require('node-fetch');
  
  const attempt = () => fetch(url).catch(err => {
    if (retries > 0) {
      console.log(`Retrying... (${retries} retries left)`);
      return retryRequest(url, retries - 1);
    }
    throw err;
  });
  return attempt();
};

retryRequest('https://example.com')
  .then(response => console.log('Success:', response.status))
  .catch(error => console.error('Failed:', error));