Express.js 响应超时 [英] Express.js Response Timeout

问题描述

问题

我一直在寻找 Express.js 的请求/响应超时，但似乎一切都与连接有关，而不是请求/响应本身.

I've been looking for request/response timeouts for Express.js but everything seems to be related to the connection rather than the request/response itself.

如果一个请求需要很长时间，它应该超时.显然这不应该发生，但即使是一个简单的错误，例如没有调用回调或没有 res.send() 的路由处理程序，浏览器将永远等待回复.

If a request is taking a long time, it should be timed out. Obviously this shouldn't happen but even a simple mistake as having a route handler without a call to the callback or without res.send(), the browser will keep waiting for a reply forever.

空路由处理程序就是一个完美的例子.

An empty route handler is a perfect example of this.

app.get('/sessions/', function(req, res, callback){});

修复

我在之前 app.use(app,router); 添加了以下内容，它似乎添加了超时功能.有没有人对此有任何经验/意见?

I added the following before app.use(app,router); and it seemed to add the timeout functionality. Does anyone have any experience/opinion on this?

app.use(function(req, res, next){
    res.setTimeout(120000, function(){
        console.log('Request has timed out.');
            res.send(408);
        });

    next();
});

请注意，我已将超时设置为 2 分钟.

Note that I've set the timeout to 2 minutes.

推荐答案

已经有一个支持超时的连接中间件:

There is already a Connect Middleware for Timeout support:

var timeout = express.timeout // express v3 and below
var timeout = require('connect-timeout'); //express v4

app.use(timeout(120000));
app.use(haltOnTimedout);

function haltOnTimedout(req, res, next){
  if (!req.timedout) next();
}

如果您打算像上面一样使用 Timeout 中间件作为顶级中间件，haltOnTimedOut 中间件需要是堆栈中定义的最后一个中间件，用于捕获超时事件.感谢@Aichholzer 的更新.

If you plan on using the Timeout middleware as a top-level middleware like above, the haltOnTimedOut middleware needs to be the last middleware defined in the stack and is used for catching the timeout event. Thanks @Aichholzer for the update.

请记住，如果您推出自己的超时中间件，4xx 状态代码用于客户端错误，5xx 用于服务器错误.408 保留用于以下情况:

Keep in mind that if you roll your own timeout middleware, 4xx status codes are for client errors and 5xx are for server errors. 408s are reserved for when:

在服务器准备等待的时间内，客户端没有产生请求.客户端可以在以后的任何时间不加修改地重复请求.

The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time.

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