Monday, 19 June 2023

What happens when a user types a URL into your browser?

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How the Web Works: From URL to Website

Every time you type a website address like www.google.com and hit enter, a complex series of events happens in the blink of an eye. In this post, we’ll break down exactly what your browser is doing behind the scenes to bring that webpage to your screen.

Step 1: The DNS Lookup

Computers don't understand names like humans do; they use numbers called IP addresses. The first thing your browser does is ask a DNS (Domain Name System) server to translate that URL into an IP address. It's like looking up a name in a massive digital phonebook.

Step 2: Establishing a Connection

Once the browser has the IP address, it needs to talk to the server. It initiates a TCP (Transmission Control Protocol) handshake. This is a "three-way" greeting where your computer and the server agree to exchange data safely and reliably.

Step 3: Sending the HTTP Request

Now that the connection is open, your browser sends a GET request. This is a formal message saying, "Hey, please send me the files for this specific webpage."

Step 4: The Server Responds

The server processes your request and sends back the website’s content, usually starting with an HTML file. Your browser then reads this file and starts asking for other pieces like images, CSS (for styling), and JavaScript (for interactivity).

Step 5: Rendering the Page

Finally, the browser takes all those files and "paints" them onto your screen. This process is called Rendering. And just like that—the website appears!

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