Django Academy · 课时

Cookie 与会话对比

选择合适的位置存储状态

Cookie 与会话对比 是 CoddyKit 上的免费 Django Academy 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Django Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Django Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Two Ways to Remember

Both cookies and sessions help your app remember a visitor, but they store data in very different places. Knowing which to pick matters. 🤔

What a Cookie Is

A cookie is a small piece of text the browser keeps and sends back on every request to your site. The data lives on the client.

Setting a Cookie

You set a cookie on the response object with set_cookie, giving it a name, a value, and optionally a lifetime.

response = HttpResponse('Hi')
response.set_cookie('lang', 'en', max_age=3600)

Reading a Cookie

Cookies arrive in request.COOKIES, a simple dictionary. Read your value back by its key on the next request.

lang = request.COOKIES.get('lang', 'en')

Where Session Data Lives

A session keeps the real data on the server and sends the browser only a key. The visitor never sees the contents.

Cookies Are Visible

Because cookies sit in the browser, the user can read and edit them. So never store secrets like prices or user roles there.

Sessions Hide the Data

Session data stays server-side, so it is the right home for anything sensitive or anything the user must not tamper with.

Size Limits

Cookies are tiny, capped near 4KB each, while sessions can hold much larger structures since they live in your database or cache.

Protect Your Cookies

Add HttpOnly so JavaScript cannot read a cookie, and Secure so it is only sent over HTTPS. Django sets these for sessionid by default.

response.set_cookie('t', '1', httponly=True, secure=True)

When to Use a Cookie

Reach for a plain cookie for small, non-secret preferences like a theme or a chosen language that is fine for the user to see.

When to Use a Session

Use a session for login state, shopping carts, or anything private. It safely backs the cookie with trusted server storage.

Quick Check

You need to store a value the user must never read or change. What fits best?

Recap

You compared cookies and sessions: cookies store small, visible data on the client, sessions keep larger, private data on the server. Pick by sensitivity and size. 🎉

常见问题解答

「Cookie 与会话对比」课时是免费的吗？

是的 — 「Cookie 与会话对比」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Django Academy 课程的其余内容，请升级到 CoddyKit PRO。 Django Academy 课程共包含 4 节课。

「Cookie 与会话对比」这节课中我会学到什么？

选择合适的位置存储状态你通过在浏览器中直接运行的动手代码来练习 Django Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Django Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Django Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「Cookie 与会话对比」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Django Academy 课中编写并运行代码吗？

能。每节 Django Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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