如何通过API调用(Node.js)从ReadableStream读取和下载文件？

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

http.createServer((req, res) => {
  // 代码将在这里编写
}).listen(3000);

http.createServer((req, res) => {
  // 发起GET请求，获取ReadableStream
  const fileStream = request.get('http://example.com/file.txt');
}).listen(3000);

http.createServer((req, res) => {
  // 发起GET请求，获取ReadableStream
  const fileStream = request.get('http://example.com/file.txt');
  
  // 创建可写流，保存文件
  const writeStream = fs.createWriteStream('file.txt');
}).listen(3000);

http.createServer((req, res) => {
  // 发起GET请求，获取ReadableStream
  const fileStream = request.get('http://example.com/file.txt');
  
  // 创建可写流，保存文件
  const writeStream = fs.createWriteStream('file.txt');
  
  // 将ReadableStream的数据通过管道传输到可写流中
  fileStream.pipe(writeStream);
}).listen(3000);

http.createServer((req, res) => {
  // 发起GET请求，获取ReadableStream
  const fileStream = request.get('http://example.com/file.txt');
  
  // 创建可写流，保存文件
  const writeStream = fs.createWriteStream('file.txt');
  
  // 将ReadableStream的数据通过管道传输到可写流中
  fileStream.pipe(writeStream);
  
  // 监听可写流的finish事件，表示文件下载完成
  writeStream.on('finish', () => {
    console.log('文件下载完成');
  });
}).listen(3000);

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

http.createServer((req, res) => {
  // 发起GET请求，获取ReadableStream
  const fileStream = request.get('http://example.com/file.txt');
  
  // 创建可写流，保存文件
  const writeStream = fs.createWriteStream('file.txt');
  
  // 将ReadableStream的数据通过管道传输到可写流中
  fileStream.pipe(writeStream);
  
  // 监听可写流的finish事件，表示文件下载完成
  writeStream.on('finish', () => {
    console.log('文件下载完成');
  });
}).listen(3000);