javascript - npm urllib ResponseTimeoutError - 如何增加超时？

Question

我正在尝试使用 urllib 转到许多不同的 URL 以获取一些 HTML 并解析它。我有一个循环，应该使用 urllib 进行大约 5000 次迭代:

urllib.request('a url here', options=[timeout=50000]).then(function (result) {
                // data is Buffer instance
                var $ = cheerio.load(result.data);
                $('dt').each(function () {
                    var news_html = cheerio.load($(this).html());
                    if (news_html('span.timestamp').html() != null) {
                        var date = news_html('span.timestamp').html();
                        var description = news_html('.story_title').html();
                        var link = news_html('a').attr('href');
                        var post = {description: description, date: date, link: link};
                        pool.query('INSERT INTO db SET ?', post, function (err, result) {
                            if (err) {
                                console.log(err);
                            }
                        });
                    }
                });
            }).catch(function (err) {
                console.error(err);
            });

大约 100 次迭代后，出现此错误:

{ ResponseTimeoutError: Response timeout for 5000ms, GET http://www.streetinsider.com/stock_lookup_news.php?q=CREG&type=major_news -1 (connected: true, keepalive socket: false)
headers: {}
    at Timeout._onTimeout (/Users/max/projects/stock-news-angular/node_modules/urllib/lib/urllib.js:715:15)
    at tryOnTimeout (timers.js:232:11)
    at Timer.listOnTimeout (timers.js:202:5)
  name: 'ResponseTimeoutError',
  requestId: 595,
  data: undefined,
  path: '/stock_lookup_news.php?q=CREG&type=major_news',
  status: -1,
  headers: {},
  res: 
   { status: -1,
     statusCode: -1,
     headers: {},
     size: 0,
     aborted: false,
     rt: 10030,
     keepAliveSocket: false,
     data: undefined,
     requestUrls: [ 'http://www.streetinsider.com/stock_lookup_news.php?q=CREG&type=major_news' ],
     timing: null,
     remoteAddress: '162.242.133.50',
     remotePort: 80 } }

我怎样才能增加超时，以便我可以完成循环并将所有需要的数据插入到我的 MySQL 数据库中？我想我没有正确理解如何设置超时，因为 npm 的 urllib 确实有一个选项来设置它。

Answer 1

我想为 request() 添加 timeout 选项参数功能可以解决您的问题。

在 API 文档中:

timeout Number | Array - Request timeout in milliseconds for connecting phase and response receiving phase. Defaults to exports.TIMEOUT, both are 5s. You can use timeout: 5000 to tell urllib use same timeout on two phase or set them seperately such as timeout: [3000, 5000], which will set connecting timeout to 3s and response 5s.