What Happens When You Type https://www.google.com in Your Browser and press Enter?

What Happens When You Type https://www.google.com in Your Browser and press Enter?

Have you ever been curious about the complex process that occurs when you enter a URL like https://www.google.com into your browser's address bar and hit Enter? In this blog post, let’s embark on a fascinating adventure through the various components involved in delivering the Google homepage to your screen.

1. DNS Request:

IP addresses serve as numerical identifiers that allow computers and devices to communicate with each other on the internet. However, due to the complexity of remembering IP addresses, we rely on domain names like 'google.com' to facilitate our browsing experience. DNS (Domain Name System) serves as an intermediary between domain names and IP addresses, converting user-friendly text-based domain names into their corresponding numerical IP addresses.

When you enter the URL https://www.google.com, your browser initiates a search for the server responsible for hosting the Google website. It checks if the address for https://www.google.com is already stored in its cache or memory, where previously resolved domain names and their corresponding IP addresses are stored. If found, the browser retrieves the IP address without going through the DNS resolution process.

If it doesn't know the IP address, it asks for help from the ISP (Internet Service Provider). The ISP is like a special company that gives us internet access.

The ISP's computer, called a DNS server, knows a lot about different websites. It's like having a friend who knows a lot about all the cool places in town!

Our computer sends a message called a DNS request to the ISP's DNS server. It asks, "Hey, do you know the IP address for 'https: //www.google.com'?"

The ISP's DNS server checks its list of website addresses. If it knows the IP address, it sends it back to our computer.

But if it doesn't know the address, it asks other computers, called root servers, for help. These root servers are like very important reference books that know about all the websites in the world!

Eventually, the root servers tell the ISP's DNS server the IP address for https://www.google.com. The ISP's DNS server shares this IP address with our computer.

Now that our computer knows the IP address, it can connect to the server that holds the Google website and show us the webpage we wanted.

It's like getting directions to a friend's house. If you don't know the way, you ask someone who knows, and they help you find it.

The DNS resolution process plays a vital role in enabling your browser to locate the accurate IP address associated with the domain name you've entered.

For a more in-depth understanding of how the DNS system functions, I recommend visiting https://howdns.works

2. TCP/IP:

After your browser obtains the IP address of the Google website, it establishes communication with the server using TCP (Transfer Control Protocol). TCP breaks down the data into smaller packets for transmission. These packets are sent individually across the network and reassembled at the destination to ensure the data arrives intact and in the correct order. TCP also includes mechanisms to retransmit lost or damaged packets, ensuring reliable data transmission.

3. Firewall:

Prior to establishing a connection with the website's server, your browser encounters a protective measure called a firewall, which acts as a security guard to thwart unauthorized access and potential threats. This ensures a secure connection between your browser and the server.

The firewall examines outgoing and incoming network traffic based on predefined rules. It filters packets by analyzing their source, destination, and protocol, where the firewall determines whether to allow or block their passage.

4. HTTPS/SSL:

Once your browser gets past the firewall, it wants to talk to the server in a secret language. This is where HTTPS (Hypertext Transfer Protocol Secure) and SSL (Secure Sockets Layer) come into play. HTTPS encrypts the data transmitted between your browser and server ensuring its security and confidentiality. SSL is the protocol that ensures the encryption and decryption of the data. SSL certificates enable encrypted communication and verify the authenticity of the server. A web browser such as Chrome displays a padlock icon at the address bar to indicate the presence of an HTTPS connection.

It's like a secret code that ensures nobody else can understand the conversation between your browser and the server, protecting sensitive information.

5. Load Balancer:

To manage a high volume of concurrent requests to the Google website, load balancers are employed. These devices act like traffic cops, directing visitors to the appropriate server capable of handling their requests. By distributing the workload across multiple servers, load balancers prevent overload on a single server, enhance efficiency, and improve the overall reliability of the website.

6. Web Server:

Once the load balancer receives a request, it directs it to the appropriate server for further processing. In the case of Google, their server functions as a web server, acting like a digital library that stores and organizes all the web pages available. This web server then handles the request, allowing you to access the Google homepage you desire.

7. Application Server:

In the realm of websites, simplicity is not always the norm. There are instances where a website requires more than just a collection of basic web pages. This is where an application server comes into play. Application servers create a conducive environment for running applications and executing business logic. In this context, “business logic” refers to the rules, processes, and algorithms that define how the application functions and operates to achieve its intended purpose. Think of them as reliable assistants, diligently ensuring that all the complex elements of a website operate smoothly. These elements can range from interactive features and search functions to personalized information.

In summary, an application server serves as the backbone of a website, empowering it with the capability to handle complex tasks and deliver an enhanced user experience.

8. Database:

As the server processes user requests, it may need to retrieve specific information. To accomplish this, servers rely on dedicated assistants called databases. Databases store structured data and provide efficient storage, retrieval, and management capabilities. In the case of Google, the server utilizes the database to fetch relevant search results and other necessary information.

Conclusion:

In conclusion, the process of going from typing https://www.google.com to witnessing the Google homepage on your screen involves a remarkable interplay of numerous components. DNS requests play a crucial role in resolving the domain, while TCP/IP establishes the connection. Firewalls protect against potential threats, and HTTPS/SSL encryption ensures the security of the data transmitted. Load balancers help distribute the load efficiently, web servers execute server-side code, and application servers handle the business logic. Additionally, databases store and retrieve the relevant data needed for the webpage or application.

The next time you use your browser, take a moment to appreciate the intricate journey it undertakes to deliver the web pages and applications that greatly enhance our lives.