js对request赋值

const express = require('express');
const app = express();

// 自定义中间件，用于修改request对象
app.use((req, res, next) => {
  // 添加一个新的属性到request对象
  req.customProperty = 'Custom Value';

  // 修改请求头
  req.headers['x-custom-header'] = 'Modified Header Value';

  // 继续处理请求
  next();
});

app.get('/', (req, res) => {
  res.send(`Custom property value: ${req.customProperty}`);
  res.send(`Modified header value: ${req.headers['x-custom-header']}`);
});

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

app.use((req, res, next) => {
  if (!req.customProperty) {
    req.customProperty = 'Default Value';
  }

  // 确保header值是字符串
  req.headers['x-custom-header'] = String(req.headers['x-custom-header']) || 'Default Header Value';

  next();
});