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我正在研究从 Google Docs 下载文件的代理。由于 Google Drive API 为非 gdrive 文件类型（pdf、txt、jpeg）提供的下载 url 是重定向并且已阅读[1]和[2]，因此我决定使用follow-redirects library。因此，当您点击http://localhost:3000/oauth2_download?accessToken=x&url=my_urlwhere x is my GDrive access_token, url 时，https://docs.google.com/uc?id=0B_31K_MP92hUNjljYjIyMzgtZTBmNS00MGMwLWIxNmQtYjMyNDFiYjY0MTJl&export=download应该下载该文件。但是，浏览器将我发送到 Google Docs 登录页面（https://docs.google.com/uc?id=0B_31K_MP92hUNjljYjIyMzgtZTBmNS00MGMwLWIxNmQtYjMyNDFiYjY0MTJl&export=download如果您已登录 Google Docs，则在浏览器中点击会下载文件）意味着未正确发送标头。知道我应该如何使用“follow-redirects”库来处理这个问题吗？先感谢您！

//var https = require('https');
var https = require('follow-redirects').https;
var app = require('express')();
var urllib = require('url');
// Downloads the file using OAuth2. Tested on Google Drive
app.get('/oauth2_download', function(req, res){
    var url = req.param('url');
    var accessToken = req.param('accessToken');
    var headers = { "Authorization": "Bearer " + accessToken }
    var searchname = urllib.parse(url).search;
    var hostname = urllib.parse(url).hostname;
    var pathname = urllib.parse(url).pathname;
    if (url && accessToken) {
        // downloading file with streaming
        var options = {
            hostname: hostname,
            port: 443,
            path: pathname + searchname,
            method: 'GET',
            headers: headers
        };
        https.request(options, function(response){
            for (var key in response.headers) {
                res.setHeader(key, response.headers[key]);
            }
            response.on('data', function(chunk) {
                res.write(chunk);
            });
            response.on('end', function() {
                res.end();
            });
            //console.log("Done downloading using OAuth2");
        }).on('error', function(e) {
            console.error(e);
        }).end();
    } else {
        res.send(404);
        res.end();
    }
});
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