Node.js Express 应用程序处理启动错误

I have app in Node.js and Express. I need to write tests for it. I have a problem with handling Express app errors. I found this How do I catch node.js/express server errors like EADDRINUSE?, but it doesn't work for me, I don't know why. I want to handle errors, which can occured while expressApp.listen() is executing (EADDRINUSE, EACCES etc.).

express = require('express')
listener = express()

#doesn't work for me
listener.on('uncaughtException', (err) ->
  #do something
)

#doesn't work too
listener.on("error", (err) ->
  #do something
)

#this works, but it caughts all errors in process, I want only in listener
process.on('uncaughtException', (err) ->
  #do something
)

listener.listen(80) #for example 80 to get error

有什么想法吗?

推荐答案

首先，expressJS 不会抛出 uncaughtException 事件，进程会抛出，所以你的代码不起作用也就不足为奇了.

app.configure(function(){
    app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
});

var myErrorHandler = function(err, req, res, next){
    ...
    // note, using the typical middleware pattern, we'd call next() here, but 
    // since this handler is a "provider", i.e. it terminates the request, we 
    // do not.
};

app.configure(function(){
    app.use(myErrorHandler);
});