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，但一切似乎都与连接有关请求/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.

如果请求需要很长时间，应该超时。显然，这不应该发生，但是即使是一个简单的错误，因为在没有调用回调或没有 res.send（）的路由处理程序中，浏览器将继续等待

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.

一个空的路由处理程序是一个很好的例子。

An empty route handler is a perfect example of this.

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

FIX

我在 app.use（app，router）; 之前添加了以下，似乎添加了超时功能。有人有任何经验/意见吗？

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

已经有一个用于超时支持的连接中间件：

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();
}

如果您计划使用超时中间件作为上述顶级中间件， 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，如果你自己的超时中间件，4xx状态码用于客户端错误，5xx用于服务器错误。 408保留时间为：

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:

客户端在服务器准备等待的时间内没有产生请求。客户可以随时重复请求而不进行修改。

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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