处理coffeescript中的Http错误 [英] Handling Http errors in coffeescript

问题描述

我正在尝试处理coffeescript中的http请求，但万一服务器停机，应用程序会死于以下错误，而我找不到正确的解决方案。

I am trying to handle a http request in coffeescript, but in case the server is down the app just dies with error below, and I can't find the right solution.

代码：

 http.get "http://localhost:8080/health", (res) ->
        status =  res.statusCode
        value = if status == 200 then 1 else 0
        console.log value
        server.push_metric metricPrefix , value
        res.on 'error', () ->
          colsone.log "Tomcat Disconected"

错误：

events.js:71
        throw arguments[1]; // Unhandled 'error' event
                       ^
Error: connect ECONNREFUSED
    at errnoException (net.js:770:11)
    at Object.afterConnect [as oncomplete] (net.js:761:19)

推荐答案

我认为您必须在单独的事件处理程序中积极侦听错误。目前，您正在将事件处理程序附加到响应（ res ），但需要将其附加到请求对象本身。参见文档。

I think you have to actively listen for the error in a separate event handler. Right now, you're attaching an event handler to the response (res), but it needs to be attached to the request object itself. See the docs.

req = http.get "http://localhost:8080/health", (res) ->
  status = res.statusCode
  value = if status == 200 then 1 else 0
  console.log value
  server.push_metric metricPrefix , value

req.on 'error', ->
  console.log "Tomcat Disconected"

此外，您在当前错误中有错字处理程序： colsone.log

Also, you have a typo in your current error handler: colsone.log

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