Express会话和Cookie会话有什么区别？

问题描述

我是 Express 的新手。由于 Express 4.x 已删除捆绑的中间件。
我需要使用任何中间件。当我阅读和，我很难理解它们之间的区别。

I am new with Express. As Express 4.x has removed bundled middlewares.Any middleware I want to use should be required. When I read the README with express-session and cookie-session on github, I feel it hard to understand the difference.

所以我尝试编写简单的代码来弄清楚。我为每个中间件运行两次。

So I try to write simple code to figure it out. I run twice for each middleware.

var express = require('express')
  , cookieParser = require('cookie-parser')
  , session = require('cookie-session')
  , express_sess = require('express-session')
  , app = express();

app.use(cookieParser())
app.use(session({ keys: ['abc'], name: 'user' }));
//app.use(express_sess({ secret: 'abc', key: 'user'}));
app.get('/', function (req, res, next) {
    res.end(JSON.stringify(req.cookies));
    console.log(req.session)
    console.log(req.cookies)
});

app.listen(3000);

对于 cookie会话，我总是得到{}在我的终端中。

For cookie-session, I always get {} in my terminal.

对于 express-session ，我会得到类似的东西。

For express-session, I get things like this.

req.session: { cookie: {
     path: '/',
     _expires: null,
     originalMaxAge: null,
     httpOnly: true
   }
}

req.cookie: {user: 's:aJ97vKA5CCwxqdTj0AV1siRQ.fWusS5+qfCKICtwkfrzcZ/Gq8P0Qdx/kx8mTBhoOhGU'}

这真的让我感到困惑。那么如何用基本用法来解释结果呢？它们之间有什么区别？我什么时候应该使用它们？

It really confuses me. So how to explain the result with the basic use? And what's the difference between them? When should I use them?

推荐答案

基本上， express-session 更抽象，它支持不同的会话存储（例如文件，数据库，缓存和诸如此类的东西）。

Basically, express-session is more abstract, it supports different session stores (like files, DB, cache and whatnot).

而 cookie-session 是简单/轻量级的基于cookie（会话是唯一支持的存储引擎：所有会话信息都存储在客户端的cookie中）。这种会话可能以而闻名。

And cookie-session is a simple / lightweight cookie-based (cookie is the only storage engine supported: all the session info is stored on the client, in a cookie) session implementation. This kind of sessions is probably most famous for its Rails implementation.

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