Lesson 09 — HTTP & HTTPS

Lesson Overview

Every time you browse the Internet, open your online banking portal, access AWS, watch YouTube, use Microsoft Teams, or log in to GoHackersCloud Academy, your browser communicates with a web server.

This communication happens using two important protocols:

HTTP (Hypertext Transfer Protocol)
HTTPS (Hypertext Transfer Protocol Secure)

HTTP made the World Wide Web possible.

HTTPS made the World Wide Web secure.

Today, nearly every enterprise application, cloud platform, API, SaaS application, and mobile application relies on HTTPS to protect sensitive information.

Understanding these protocols is essential for Cloud Engineers, Cybersecurity Professionals, DevOps Engineers, Software Developers, and Network Engineers.

Learning Objectives

After completing this lesson, you will be able to:

Explain HTTP and HTTPS.
Understand how browsers communicate with servers.
Learn how SSL/TLS encrypts web traffic.
Differentiate between HTTP and HTTPS.
Understand common HTTP methods.
Identify common HTTP status codes.
Explain why HTTPS is critical for enterprise security.

What is HTTP?

HTTP (Hypertext Transfer Protocol) is an application-layer protocol used to transfer web content between clients and servers.

Whenever you open a website, your browser sends an HTTP request to the web server.

The server processes the request and returns an HTTP response.

Example:

Browser

↓

HTTP Request

↓

Web Server

↓

HTTP Response

↓

Website Displayed

HTTP is the foundation of the World Wide Web.

What is HTTPS?

HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP.

HTTPS encrypts communication using TLS (Transport Layer Security), ensuring that data exchanged between the browser and the server cannot be easily intercepted or modified.

Example:

Browser

↓

Encrypted HTTPS Connection

↓

Web Server

↓

Encrypted Response

↓

Website Displayed

Today, HTTPS is the standard protocol for secure web communication.

Why HTTPS Matters

Imagine logging into your bank account.

Without HTTPS:

Usernames can be intercepted.
Passwords can be stolen.
Credit card details can be exposed.
Sessions can be hijacked.

With HTTPS:

Data is encrypted.
Server identity is verified.
Communication remains confidential.
Data integrity is maintained.

HTTPS protects users and businesses from many common cyber attacks.

How HTTP Works

When a user enters:

https://www.gohackerscloud.com

the browser performs the following steps:

Browser

↓

DNS Lookup

↓

TCP Connection

↓

HTTP/HTTPS Request

↓

Web Server

↓

Application

↓

Database

↓

HTTP Response

↓

Browser Displays Page

This entire process typically takes only a few milliseconds.

HTTP Request

A browser sends an HTTP request containing information such as:

Request Method
URL
Headers
Cookies
Request Body (if applicable)

Example:

GET /courses HTTP/1.1

Host: www.gohackerscloud.com

The server processes the request and generates a response.

HTTP Response

Example:

HTTP/1.1 200 OK

The response typically contains:

Status Code
Headers
HTML
Images
CSS
JavaScript
JSON Data

The browser then renders the webpage.

Common HTTP Methods

Method	Purpose
GET	Retrieve information
POST	Submit new information
PUT	Replace existing information
PATCH	Update existing information
DELETE	Remove information
HEAD	Retrieve headers only
OPTIONS	Display supported methods

REST APIs rely heavily on these methods.

Common HTTP Status Codes

Success (2xx)

Code	Meaning
200	OK
201	Created
204	No Content

Redirection (3xx)

Code	Meaning
301	Permanent Redirect
302	Temporary Redirect

Client Errors (4xx)

Code	Meaning
400	Bad Request
401	Unauthorized
403	Forbidden
404	Not Found

Server Errors (5xx)

Code	Meaning
500	Internal Server Error
502	Bad Gateway
503	Service Unavailable
504	Gateway Timeout

Learning these codes makes troubleshooting much easier.

HTTP vs HTTPS

HTTP	HTTPS
Port 80	Port 443
No encryption	TLS encryption
Vulnerable to interception	Secure communication
Not recommended for sensitive data	Recommended for all public websites
Faster setup	Secure authentication and encryption

Today, nearly every public-facing application uses HTTPS.

SSL vs TLS

Historically, websites used SSL (Secure Sockets Layer).

Modern systems now use TLS (Transport Layer Security).

Although people often say “SSL Certificate,” modern certificates actually use TLS.

TLS provides:

Encryption
Authentication
Data Integrity

TLS Handshake

Before encrypted communication begins, the browser and server establish trust.

Simplified process:

Browser

↓

Client Hello

↓

Server Hello

↓

Certificate Exchange

↓

Certificate Validation

↓

Encryption Keys Generated

↓

Secure HTTPS Session

After the handshake, all communication is encrypted.

Digital Certificates

HTTPS relies on digital certificates to verify the identity of websites.

Certificates contain:

Domain Name
Organization Name
Public Key
Expiration Date
Certificate Authority

Browsers verify these certificates automatically before establishing a secure connection.

Certificate Authorities (CA)

Certificates are issued by trusted Certificate Authorities.

Examples include:

Let’s Encrypt
DigiCert
GlobalSign
Sectigo

These organizations validate website ownership and issue trusted certificates.

HTTP & HTTPS in Cloud Computing

Cloud platforms provide managed HTTPS services.

AWS

AWS Certificate Manager (ACM)
Elastic Load Balancer
CloudFront

Microsoft Azure

Azure Application Gateway
Azure Front Door
Azure Key Vault Certificates

Google Cloud

Certificate Manager
Cloud Load Balancer

Cloud Engineers frequently configure HTTPS for production applications.

HTTP & HTTPS in Cybersecurity

Security teams monitor HTTPS traffic to:

Detect attacks
Validate certificates
Identify phishing websites
Protect APIs
Secure authentication
Prevent Man-in-the-Middle (MITM) attacks

HTTPS is one of the most important security controls for Internet-facing applications.

Common Troubleshooting Commands

Windows

curl https://www.gohackerscloud.com

Test-NetConnection www.gohackerscloud.com -Port 443

Linux

curl -I https://www.gohackerscloud.com

openssl s_client -connect www.gohackerscloud.com:443

These commands help verify connectivity, TLS configuration, and certificates.

Real-World Example

A student logs into GoHackersCloud Academy.

Student Browser

↓

HTTPS

↓

Cloud Load Balancer

↓

Application Server

↓

Authentication Service

↓

Dashboard

Throughout the session:

Credentials are encrypted.
Session cookies are protected.
User data remains confidential.
Certificates verify the server’s identity.

Without HTTPS, sensitive information could be intercepted.

Best Practices

As an IT professional:

Always use HTTPS for public applications.
Redirect HTTP traffic to HTTPS.
Use modern TLS versions.
Renew certificates before they expire.
Disable weak encryption algorithms.
Monitor certificate validity.
Enable HTTP Strict Transport Security (HSTS).
Regularly test web application security.

Key Takeaways

After completing this lesson, you should understand:

What HTTP and HTTPS are.
How browsers communicate with web servers.
The differences between HTTP and HTTPS.
Common HTTP methods and status codes.
How TLS secures web communication.
Why HTTPS is essential in enterprise and cloud environments.

Summary

HTTP and HTTPS are among the most widely used protocols on the Internet.

While HTTP enables communication between browsers and web servers, HTTPS protects that communication through encryption, authentication, and integrity checks.

Whether you’re deploying applications in AWS, securing APIs, configuring Kubernetes Ingress, or troubleshooting enterprise web applications, understanding HTTP and HTTPS is a fundamental networking skill that you’ll use throughout your IT career.

Next Lesson

➡️ Lesson 10 — Common Network Services

In the next lesson, you’ll explore the essential network services used in enterprise environments, including FTP, SSH, SMTP, IMAP, LDAP, NTP, SMB, and RDP, and understand how they support business operations.