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# Week 4: HTTP & Basic Server - Complete Guide

## 1. HTTP Module: Creating Basic Server

### Understanding the HTTP Module

The **http** module is a core Node.js module that provides functionality to create HTTP servers and clients. It's built on top of the **net** module and handles the HTTP protocol implementation.

**Basic Server Creation:**

```javascript
const http = require('http');

// Create a basic server
const server = http.createServer((request, response) => {
    // This callback function runs for every incoming request
    response.writeHead(200, { 'Content-Type': 'text/plain' });
    response.end('Hello, World!');
});

// Start the server
const PORT = 3000;
server.listen(PORT, () => {
    console.log(`Server running on http://localhost:${PORT}`);
});
```

## 2. Request/Response Objects Deep Dive

### Request Object (IncomingMessage)

The request object contains all information about the incoming HTTP request.

**Request Properties:**

```javascript
server.on('request', (req, res) => {
    console.log('=== REQUEST DETAILS ===');
    
    // Basic request information
    console.log('Method:', req.method);           // GET, POST, PUT, DELETE, etc.
    console.log('URL:', req.url);                 // /path?query=value
    console.log('HTTP Version:', req.httpVersion); // 1.1
    
    // Headers
    console.log('Headers:', req.headers);
    console.log('User-Agent:', req.headers['user-agent']);
    console.log('Content-Type:', req.headers['content-type']);
});
```

This covers the basics of HTTP servers and request handling in Node.js.

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