说到处理错误，监听请求错误甚至更好。我甚至会通过检查响应代码来验证。这里认为只有200个响应代码成功，但其他代码可能很好。

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

const download = (url, dest, cb) => {
    const file = fs.createWriteStream(dest);

    const request = http.get(url, (response) => {
        // check if response is success
        if (response.statusCode !== 200) {
            return cb('Response status was ' + response.statusCode);
        }

        response.pipe(file);
    });

    // close() is async, call cb after close completes
    file.on('finish', () => file.close(cb));

    // check for request error too
    request.on('error', (err) => {
        fs.unlink(dest, () => cb(err.message)); // delete the (partial) file and then return the error
    });

    file.on('error', (err) => { // Handle errors
        fs.unlink(dest, () => cb(err.message)); // delete the (partial) file and then return the error
    });
};

尽管这段代码相对简单，但我建议使用request模块，因为它处理更多http不支持的协议(你好，HTTPS!)。

可以这样做:

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

const download = (url, dest, cb) => {
    const file = fs.createWriteStream(dest);
    const sendReq = request.get(url);
    
    // verify response code
    sendReq.on('response', (response) => {
        if (response.statusCode !== 200) {
            return cb('Response status was ' + response.statusCode);
        }

        sendReq.pipe(file);
    });

    // close() is async, call cb after close completes
    file.on('finish', () => file.close(cb));

    // check for request errors
    sendReq.on('error', (err) => {
        fs.unlink(dest, () => cb(err.message)); // delete the (partial) file and then return the error
    });

    file.on('error', (err) => { // Handle errors
        fs.unlink(dest, () => cb(err.message)); // delete the (partial) file and then return the error
    });
};

编辑:

要使它与https兼容，请更改

const http = require('http');

to

const http = require('https');

您可以尝试使用res.redirect到https文件下载url，然后它将下载文件。

如:res.redirect(“https / / static.file.com/file.txt”);

没有库，它可能是错误的，只是指出。以下是一些例子:

不能处理http重定向，比如这个url https://calibre-ebook.com/dist/portable，它是二进制的。 http模块不能https url，你将得到协议“https:”不支持。

以下是我的建议:

调用系统工具，如wget或curl 使用一些类似node-wget-promise的工具，使用起来也非常简单。 Var wget = require('node-wget-promise'); wget(“http://nodejs.org/images/logo.svg”);

我建议你使用res.download，如下:

app.get('/download', function(req, res){
  const file = `${__dirname}/folder/abc.csv`;
  res.download(file); // Set disposition and send it.
});

我发现这种方法是最有帮助的，特别是当涉及到pdf和其他随机文件时。

import fs from "fs";

  fs.appendFile("output_file_name.ext", fileDataInBytes, (err) => {
    if (err) throw err;
    console.log("File saved!");
  });

这里还有另一种方法来处理它没有第三方依赖，也搜索重定向:

        var download = function(url, dest, cb) {
            var file = fs.createWriteStream(dest);
            https.get(url, function(response) {
                if ([301,302].indexOf(response.statusCode) !== -1) {
                    body = [];
                    download(response.headers.location, dest, cb);
                  }
              response.pipe(file);
              file.on('finish', function() {
                file.close(cb);  // close() is async, call cb after close completes.
              });
            });
          }