text: // // 标准输入输出
  // process.stdin.pipe(process.stdout)
  
  // const http = require('http')
  // const server = http.createServer((req, res) => {
  //   if (req.method === 'POST') {
  //     req.pipe(res)
  //   }
  // })
  
  // server.listen(8000)
  
  // // 复制文件
  // const fs = require('fs')
  // const path = require('path')
  
  // const fileName1 = path.resolve(__dirname, 'data.txt')
  // const fileName2 = path.resolve(__dirname, 'data-bak.txt')
  
  // const readStream = fs.createReadStream(fileName1)
  // const writeStream = fs.createWriteStream(fileName2)
  
  // readStream.pipe(writeStream)
  // readStream.on('data', chunk => {
  //   console.log(chunk.toString())
  // })
  // readStream.on('end', () => {
  //   console.log('copy done')
  // })
  
  const http = require('http')
  const fs = require('fs')
  const path = require('path')
  const fileName1 = path.resolve(__dirname, 'data.txt')
  const server = http.createServer((req, res) => {
    if (req.method === 'GET') {
      const readStream = fs.createReadStream(fileName1)
      readStream.pipe(res)
    }
  })
  
  server.listen(8000)