Node.js如何使用request.js发出多个http请求

Question

我正在编写一种带有Node.js和request.js，async npm模块的web-scrape-client。

我希望每个url的async.times（）函数中的request（）调用都会向服务器发出并发请求。

但是实际请求一个接一个地触发，即使在async.times（）中调用urls request（）函数的次数也是如此。

代码如下

request.defaults({
pool:{
    maxSockets:50
} });
...
...
async.times(scrapeTarget.totalPage, function(index, next) {
                    scrapeTarget.downloadedListPages++;
                    var reqPageNum = index+1;

                    var listReqOpt = requestUtil.makeOption('url:listPage', requestOption);
                    listReqOpt.url += '?page=' + reqPageNum;
                    listReqOpt.jar = cookieJar;

                    console.log('['+reqPageNum+'] : request page');

                    console.time(index);

                    request(listReqOpt, function(err, response, body) {
                            // response job here !
                                console.log('['+reqPageNum+'] : got response');
                                console.timeEnd(index);

                        next(null,{'done':reqPageNum});
                    }).pipe(fs.createWriteStream(archiveDir + '/listPage' + reqPageNum + '.html'));

                }, 
 ...
 ...);

，结果

[1] : request page
[2] : request page
[3] : request page
[4] : request page
[5] : request page
[6] : request page
[7] : request page
...
[212] : request page
[213] : request page
[214] : request page
[5] : got response
4: 3607ms
[3] : got response
2: 5844ms
[4] : got response
3: 8171ms
[1] : got response
0: 10221ms
[2] : got response
1: 12689ms
[6] : got response
5: 14313ms
[7] : got response
6: 16630ms
[8] : got response
...
[16] : got response
15: 36488ms
[17] : got response
16: 38807ms
[18] : got response
17: 41000ms
[19] : got response
18: 43193ms
...
...
I break running because it takes too long.

我正在运行代码 Node.js 0.10.x 要求2.36.0 在Ubuntu 14.04和Cloud 9 bash上

如何同时并行运行请求？