快速请求被两次调用 [英] Express request is called twice

问题描述

要学习node.js，我正在创建一个小型应用程序，该应用程序将一些rss提要存储在mongoDB中，对其进行处理，并从中创建一个单独的提要(按日期排序).

To learn node.js I'm creating a small app that get some rss feeds stored in mongoDB, process them and create a single feed (ordered by date) from these ones.

它解析约50个rss提要的列表，其中包含约1000个博客项目，因此要解析整个提要很长，因此我放置了以下req.connection.setTimeout(60*1000);来获得足够长的时间来获取和解析所有提要

It parses a list of ~50 rss feeds, with ~1000 blog items, so it's quite long to parse the whole, so I put the following req.connection.setTimeout(60*1000); to get a long enough time out to fetch and parse all the feeds.

一切正常，但是请求被调用两次. (我与Wireshark进行了核对，我认为这与Favicon无关).

Everything runs quite fine, but the request is called twice. (I checked with wireshark, I don't think it's about favicon here).

我真的不明白.

您可以在这里进行自我测试: http://mighty-springs-9162. herokuapp.com/feed/mde/20 (它应该使用有关"mde"的最后20篇文章创建一个rss feed.)

You can test yourself here : http://mighty-springs-9162.herokuapp.com/feed/mde/20 (it should create a rss feed with the last 20 articles about "mde").

代码在这里: https://github.com/xseignard/rss-unify

如果我们关注有趣的地方:

And if we focus on the interesting bits :

我有一条这样定义的路线:app.get('/feed/:name/:size?', topics.getFeed);

I have a route defined like this : app.get('/feed/:name/:size?', topics.getFeed);

topics.getFeed是这样的:

function getFeed(req, res) {
  // 1 minute timeout to get enough time for the request to be processed
  req.connection.setTimeout(60*1000);   

  var name = req.params.name;
  var callback = function(err, topic) {
  // if the topic has been found
  if (topic) {
    // aggregate the corresponding feeds
    rssAggregator.aggregate(topic, function(err, rssFeed) {
      if (err) {
        res.status(500).send({error: 'Error while creating feed'});
      }
      else {
        res.send(rssFeed);
      }
    },
    req);
  }
  else {
    res.status(404).send({error: 'Topic not found'});
  }};
  // look for the topic in the db
  findTopicByName(name, callback);
}

所以没什么花哨的，但仍然，此getFeed函数被调用了两次.

So nothing fancy, but still, this getFeed function is called twice.

那是怎么了?有什么主意吗?

What's wrong there? Any idea?

推荐答案

这使我很烦了.很可能是Firebug扩展，它在后台发送每个GET请求的副本.尝试关闭Firebug，以确保不是问题所在.

This annoyed me for a long time. It's most likely the Firebug extension which is sending a duplicate of each GET request in the background. Try turning off Firebug to make sure that's not the issue.

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