结束“结束”的正确方法是什么？快速/连接中间件的请求？ [英] What is the correct way to "end" a request from express/connect middleware?

问题描述

假设我有这样的中间件；

Assuming I have middleware such as this;

var express = require('express');
var app = express();

app.use(function (req, res, next) {
    var host = "example.com";

    if (req.host !== host) {
        res.redirect(301, host + req.originalUrl);
        res.end();
    }
});

我需要遵守哪些规则？

1. 我应该打电话给 res.end（）吗？ （或者 res.redirect（）为我这样做吗？）


2. 我应该打电话给 next（ ）？ （或者connect是否检测到请求已结束并干净地退出？）


3. 假设我应该正在调用 next（），我想这意味着 I 可能正在接收对我的中间件的请求，该请求可能已经被链中其他较高层的中间件终止了；如何保护自己免受此侵害？

1. Should I be calling res.end()? (or does res.redirect() do this for me?)
2. Should I be calling next()? (or does connect detect the request has ended and exit cleanly?)
3. Assuming that I should be calling next(), I guess that means I can potentially be receiving requests to my middleware which may have already been ended by other middleware higher in the chain; how do I protect myself against this?

推荐答案

1. res.redirect（）确实会调用 res.end（）本身；


2. 您如果中间件不是终点，应该调用 next（）；在生成重定向的情况下，它是一个端点，并且不应该调用 next（），但是如果 req.host === host ，您需要调用 next（）将请求沿链移动到其他中间件/路由；


3. 请求不会终止，响应会终止。这样做的时候，它将终止中间件链，因此您不必担心。

1. res.redirect() indeed calls res.end() itself;
2. You should call next() if your middleware isn't the end point; in the case of generating a redirect, it is an endpoint and next() shouldn't be called, but if req.host === host, you need to call next() to move the request up the chain to other middleware/routes;
3. A request doesn't get ended, a response does. And when it does, it will end the middleware chain so you don't have to worry about it.

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