Chapter 20: Cookies and Sessions in C#

Set cookies, manage sessions, SameSite. In this chapter, you will learn cookies and sessions in depth with C# code examples, explanations, and best practices.

Overview

This chapter covers cookies and sessions for Kungfu.js developers using C#. We will start with the basics, move through practical examples, and end with advanced techniques and common pitfalls.

Why This Matters

Understanding cookies and sessions is essential because it is a core part of building web applications. Every real-world app needs to handle set cookies, manage sessions, samesite. Skipping this chapter would leave a gap in your knowledge that would cause problems later.

Code Example

Here is how to handle requests and responses in C#:

// Set a cookie
app.get('/set-cookie', (req) => {
    return {
        status: 200,
        headers: {
            'set-cookie': 'session_id=abc123; Path=/; HttpOnly; Max-Age=3600; SameSite=Strict'
        },
        body: 'Cookie set'
    };
});

// Read a cookie
app.get('/check', (req) => {
    const cookies = req.headers['cookie'] || '';
    // Parse cookies...
});

Common Mistakes

• Not reading the documentation: Always check the API reference when something does not work as expected.
• Skipping security: Never disable the default middleware unless you have a very good reason. Security is not optional.
• Not testing: Write tests for your handlers. Kungfu.js makes this easy with the built-in test utilities.

Summary

In this chapter, you learned about cookies and sessions in C#. You saw code examples, understood how things work under the hood, and learned about common mistakes to avoid.

What is Next?

In chapter 21, we will cover Database Connection: Connect to SQLite, PostgreSQL, MySQL, Supabase.