在nodejs https.request中处理ECONNRESET [英] Handle ECONNRESET in nodejs https.request

问题描述

因此有时会出现网络或服务器问题，并且ECONNRESET会导致https.request失败。我认为正确的做法是重试指数延迟，从无延迟开始，直到数小时。但是，如果比较容易，我可以延迟5分钟。我读过一篇有关异步错误处理的文章，但找不到类似这样的简单示例的任何例子。请给我一个可行的例子吗？
谢谢！

So sometimes there is network or server issues and https.request fails with ECONNRESET. I think the proper thing to do would be to retry with exponential backoff delays, starting with none, and building up to several hours. But if it's easier I could just use a 5 minute delay. I've read an article on asynchronous error handling, but I haven't been able to find any examples for something simple like this. Could I get a working example please? Thanks!

推荐答案

只需附加一个错误事件处理程序在请求对象上：

Just attach an error event handler on the request object:

var req = https.request(...);
req.on('error', function(err) {
  // handler `err` here ...
});

重试：

// waits 1 second on first error, then 2, then 4, then 8, etc.
function makeRequest(url, lastTimeout) {
  lastTimeout || (lastTimeout = 500);
  var req = https.request(url, ...);
  req.on('error', function(err) {
    console.error(err);
    lastTimeout *= 2;
    setTimeout(makeRequest, lastTimeout, url, lastTimeout);
  });
}

// call function
makeRequest('https://google.com');

您可能会希望在重试上设置某种上限，所以它不会无限期重试。您还可以向 lastTimeout 添加随机毫秒数，以使每次的精确度都不那么精确。

You will probably want to put some kind of upper bound on the retries though, so it doesn't retry indefinitely. You could also add to lastTimeout a random number of milliseconds to make it less exactly exponential every time.

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