AWS Builder Center

Builder Center

What Actually Happens When You Open a Website?

What Actually Happens When You Open a Website?

Have you ever wondered what actually happens when you type a website address and hit Enter? This article breaks down that journey in a simple way, from DNS and HTTPS to servers, databases, and the response you finally see in your browser.

You type a website URL into your browser, press Enter, and the page appears within seconds.
It feels simple.
But behind that single click, multiple systems work together — DNS, networking, TLS, load balancers, servers, applications, databases, and cloud infrastructure.
Understanding this flow is useful whether you're learning Cloud, DevOps, Networking, Backend, or AWS.
 
 
  1. You Enter a Domain Name
    Suppose you open: https://example.com
    Your browser needs to find the server responsible for example.com.
    But computers don't communicate using domain names. They use IP addresses.
    So the first question is:
    What IP address belongs to example.com?
That's where DNS comes in.
 
2. DNS Finds the IP Address
DNS stands for Domain Name System.
It translates:
example.com → IP address
Your browser may first check its local DNS cache. If the address isn't available, the request goes through the DNS resolution process.
A simplified flow is:
Browser → DNS Resolver → DNS Server → IP Address
In AWS, services such as Amazon Route 53 can provide DNS management.
So now the browser knows where to send the request.
 
3. The Request Travels Across the Internet
Your browser now needs to communicate with the destination server.
The request travels through multiple network devices and networks before reaching the destination.
At this stage, concepts such as:
  • IP
  • TCP
  • Routing
  • Ports
  • Packets
    become important. For HTTPS traffic, the destination normally uses port 443.
 
 
  1. HTTPS Establishes a Secure Connection
    Because we're using:
    https://
    the communication needs to be encrypted.
    TLS helps establish a secure connection between the client and server.
    This protects sensitive information from being transmitted as plain text.
    For example:
    HTTP
    Client → "password=123456"
would be unsafe.
With HTTPS, the communication is encrypted.
This is one reason you should avoid entering sensitive information into websites that don't properly use HTTPS.
 
5. The Request Reaches the Load Balancer
Large applications usually don't depend on a single server.
Instead, traffic can be distributed across multiple servers.
A simplified architecture could look like:
1
2
3
4
5
6
7
Internet
↓
DNS
↓
Load Balancer
↙ ↓ ↘
Server Server Server
 
In AWS, Elastic Load Balancing (ELB) can distribute incoming traffic across application resources.
This improves availability and helps prevent one server from becoming a single point of failure.
6. The Application Processes Your Request
Now the request reaches the application.
For example, when you open an e-commerce website, the application might need to:
  • identify your session
  • check authentication
  • retrieve product information
  • calculate prices
  • check inventory
  • prepare the response
    The application could be running on EC2, containers, Kubernetes, or serverless infrastructure.
 
 
  1. The Application May Need a Database
    The application often needs information stored in a database.
    For example:
1
2
3
4
5
6
7
8
9
User Request
↓
Application
↓
Database
↓
Application
↓
Response
 
The database might contain:
  • User information
  • Products
  • Orders
  • Payments
  • Inventory
    In AWS, databases can be hosted using services such as Amazon RDS or Amazon DynamoDB, depending on the application's requirements.
 
 
  1. The Response Travels Back
    After processing the request, the application sends a response back.
    The simplified flow becomes:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Browser
↓
DNS
↓
Internet
↓
Load Balancer
↓
Application
↓
Database
↓
Application
↓
Load Balancer
↓
Internet
↓
Browser
 
 
Your browser then processes the response and renders the webpage.
And all of this can happen in seconds.
But Where Can Things Go Wrong?
This is where understanding the architecture becomes really useful.
A website can fail at many different points.
Layer Possible Problem
DNS Domain doesn't resolve
Network Connectivity problem
TLS Certificate/configuration issue
Load Balancer Health check failure
Server CPU or memory exhaustion
Application Code error
Database Connection/query problem
AWS Resource Configuration or capacity issue
So when a website is down, saying “the server is down” isn't always accurate.
The problem could be anywhere in the request path.
How Cloud Makes This More Reliable
Cloud architecture allows us to design for these failures.
For example:
1
2
3
4
5
6
7
8
9
Users
↓
Route 53
↓
Load Balancer
↙ ↘
Server 1 Server 2
↘ ↙
Database
 
 
We can improve this architecture using:
  • Multiple Availability Zones
  • Load balancing
  • Auto Scaling
  • Health checks
  • Monitoring
  • Backups
  • Logging
  • Alerts
  • Disaster recovery strategies
    The goal isn't to assume “nothing will fail.”
    The goal is to design the system so that one failure doesn't take everything down.
    A Simple Way to Remember It
When you open a website, think:
  • Find → Connect → Secure → Route → Process → Retrieve → Respond
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
DOMAIN
↓
DNS
↓
NETWORK
↓
HTTPS
↓
LOAD BALANCER
↓
APPLICATION
↓
DATABASE
↓
RESPONSE
↓
BROWSER
 
Final Thought
The next time you open a website, remember that you're not simply “opening a webpage.”
You're triggering a chain of systems working together.
Understanding that chain makes it much easier to troubleshoot real-world problems — whether you're working with AWS, DevOps, cloud infrastructure, networking, or application development.
The better you understand the journey of a request, the better you can understand where an application can fail.
# cloud-concepts# devops# networking# web-development# dns
Any opinions in this article are those of the individual author and may not reflect the opinions of AWS.
Enjoyed reading this content? Let the author know!

Your likes, comments, shares, and saves help creators reach more builders.

Loading recommendations

Loading article