Today, let's start with the first topic:
✅ How the web works, browser, server, HTTP
How the web works
- You open a website by typing a URL in the browser
- Example:
https://example.com/- The browser breaks the URL into parts
- Protocol: https
- Domain: example.com
- Path: /
- The browser asks DNS for the server IP
- DNS works like a phonebook
- It returns an IP like 93.184.216.34
- The browser connects to the server using this IP
- A request goes to the server
- The server sends a response
- The browser renders the response as a webpage
Browser explained
- Browser is a client
- Examples: Chrome, Firefox, Edge
- Your code runs here
- Browser responsibilities:
- Sends HTTP requests
- Receives HTTP responses
- Parses HTML
- Applies CSS
- Executes JavaScript
Real example
- You click a button
- JavaScript runs in the browser
- It sends a request using fetch
- Browser waits for response
Server explained
- Server is a machine running 24x7
- It listens for requests
- It processes logic
- It sends responses
- Server responsibilities:
- Handle requests
- Run backend code
- Talk to database
- Return data or HTML
- Examples:
- Node.js server with Express
- Python server with Django
- Java server with Spring
HTTP explained
- HTTP means HyperText Transfer Protocol
- It defines how browser and server talk
- Request contains:
- Method
- URL
- Headers
- Body
- Common HTTP methods:
- GET: Fetch data
- POST: Send data
- PUT: Update data
- DELETE: Remove data
- Response contains:
- Status code
- Headers
- Body
- Common status codes:
- 200: Success
- 201: Created
- 400: Bad request
- 401: Unauthorized
- 404: Not found
- 500: Server error
Simple flow example
- You open a login page
- Browser sends GET request
- Server sends HTML
- You submit form
- Browser sends POST request
- Server validates data
- Server sends response
Why this matters for you
- You understand frontend vs backend clearly
- You debug API issues faster
- You build better full stack apps
- You explain system flow in interviews
Mini practice task
- Open any website
- Open DevTools
- Go to Network tab
- Reload page
- Observe requests and status codes
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