如何阻止节点js服务器崩溃 [英] how to stop node js server from crashing

问题描述

我是节点js的新手。我试图创建一个简单的HTTP服务器。我按照着名的例子创建了一个'Hello World！'服务器，如下所示。

I am new to node js. I was trying to create a simple HTTP server. I followed the famous example and created a 'Hello World!' server as follows.

var handleRequest = function(req, res) {
  res.writeHead(200);
  res1.end('Hello, World!\n');
};

require('http').createServer(handleRequest).listen(8080);

console.log('Server started on port 8080');

运行此代码将按预期正确启动服务器。但是尝试访问 http://127.0.0.1:8080 会因为抛出 res1 的错误而导致崩溃定义。我希望服务器仍然可以继续运行，并在遇到错误时正常报告错误。

Running this code would start the server properly as expected. But trying to access http://127.0.0.1:8080 would crash it by throwing an error that res1 is not defined. I would like to have the server still continue running and gracefully report errors whenever it encounters it.

我如何实现它？我尝试过try-catch，但这对我没有帮助:(

How do I achieve it? I tried try-catch but that isn't helping me :(

推荐答案

这里有很多评论。首先，为了使您的示例服务器正常工作，需要在使用之前定义handleRequest。

There are a bunch of comments here. First of all, for your example server to work, handleRequest needs to be defined BEFORE using it.

1-可以处理实际需要的，阻止进程退出的内容通过处理uncaughtException（文档）事件：

1- What you actually want, which is preventing the process to exit, can be handled by handling uncaughtException (documentation) event:

var handleRequest = function(req, res) {
    res.writeHead(200);
    res1.end('Hello, World!\n');
};
var server = require('http').createServer(handleRequest);
process.on('uncaughtException', function(ex) {
    // do something with exception
});
server.listen(8080);
console.log('Server started on port 8080');

2-我建议在代码中使用try {} catch（e）{}，例如：

2- I would recomment to use try{} catch(e) {} on your code, such as:

var handleRequest = function(req, res) {
    try {
      res.writeHead(200);
      res1.end('Hello, World!\n');
    } catch(e) {
      res.writeHead(200);
      res.end('Boo');
    }
};

3-我猜这个例子只是一个例子而不是实际的代码，这是一个解析错误，可以预防。我提到这一点，因为你需要在异常捕获处理程序上没有解析错误。

3- I guess the example was just an example and not actual code, this is a parsing error that can be prevented. I mention this, since you NEED to NOT have parsing errors on Exception catch handlers.

4-请注意节点进程将来会被域名取代

4- Please note that node process is going to be replaced in the future with domain

5-我宁愿使用像表达这样的框架，而不是这样做。

5- I'd rather use a framework like express, than doing this stuff.

6-推荐讲座： StackOverflow - NodeJS异常处理的最佳实践

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