Node Js Webserver始终链接到同一页面

const http = require('http');
const url = require('url');

const server = http.createServer((req, res) => {
  const parsedUrl = url.parse(req.url, true);
  if (parsedUrl.pathname === '/page1') {
    res.end('This is page 1');
  } else if (parsedUrl.pathname === '/page2') {
    res.end('This is page 2');
  } else {
    res.end('Default page');
  }
});

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

const http = require('http');
const fs = require('fs');
const path = require('path');

const server = http.createServer((req, res) => {
  let filePath = '.' + req.url;
  if (filePath == './') {
    filePath = './index.html';
  }

  const extname = String(path.extname(filePath)).toLowerCase();
  const mimeTypes = {
    '.html': 'text/html',
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpg',
    '.gif': 'image/gif',
    '.svg': 'image/svg+xml',
    '.wav': 'audio/wav',
    '.mp4': 'video/mp4',
    '.woff': 'application/font-woff',
    '.ttf': 'application/font-ttf',
    '.eot': 'application/vnd.ms-fontobject',
    '.otf': 'application/font-otf',
    '.wasm': 'application/wasm'
  };

  const contentType = mimeTypes[extname] || 'application/octet-stream';

  fs.readFile(filePath, (error, content) => {
    if (error) {
      if (error.code == 'ENOENT') {
        // Page not found
        fs.readFile('./404.html', (error, content) => {
          res.writeHead(404);
          res.end(content, 'utf-8');
        });
      } else {
        // Some server error
        res.writeHead(500);
        res.end(`Server Error: ${error.code}`);
      }
    } else {
      // Success
      res.writeHead(200, { 'Content-Type': contentType });
      res.end(content, 'utf-8');
    }
  });
});

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

res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
res.setHeader('Pragma', 'no-cache');
res.setHeader('Expires', '0');