HTTP and HTTPS in Computer Networks - Step-by-Step Execution

Concept Flow - HTTP and HTTPS

User enters URL

↓

Browser sends HTTP request

↓

Server receives request

↓

Server processes request

↓

Server sends response

↓

Browser receives response

↓

Browser displays webpage

↓

Browser and server establish secure connection

↓

Data encrypted during transfer

This flow shows how a browser requests a webpage using HTTP or HTTPS, with HTTPS adding a secure encrypted connection step.

Execution Sample

Computer Networks

User types: http://example.com
Browser sends HTTP request
Server responds with webpage
Browser displays page

This example shows a simple HTTP request and response cycle to load a webpage.

Analysis Table

Step	Action	Protocol	Security	Result
1	User enters URL	HTTP or HTTPS	None yet	Request ready to send
2	Browser sends request	HTTP	No encryption	Request sent in plain text
3	Server receives request	HTTP	No encryption	Server processes request
4	Server sends response	HTTP	No encryption	Response sent in plain text
5	Browser receives response	HTTP	No encryption	Page data received
6	Browser displays page	HTTP	No encryption	Page shown to user
---	Switch to HTTPS example	HTTPS	Encryption starts	Secure connection begins
7	Browser and server establish secure connection	HTTPS	Encryption starts	Secure connection established
8	Browser sends HTTPS request	HTTPS	Encrypted	Request sent securely
9	Server receives HTTPS request	HTTPS	Encrypted	Server processes securely
10	Server sends HTTPS response	HTTPS	Encrypted	Response sent securely
11	Browser receives HTTPS response	HTTPS	Encrypted	Page data received securely
12	Browser displays page	HTTPS	Encrypted	Page shown securely
13	Connection ends	HTTPS	Encrypted	Secure session closed

💡 Process ends after browser displays page and connection closes; HTTPS adds encryption steps.

State Tracker

Variable	Start	After HTTP Request	After HTTP Response	After HTTPS Request	After HTTPS Response	Final
Request Data	Empty	Plain text sent	N/A	Encrypted sent	N/A	N/A
Response Data	Empty	N/A	Plain text received	N/A	Encrypted received	Displayed
Connection Security	None	None	None	Encryption started	Encryption active	Encryption ended

Key Insights - 3 Insights

Why is data sent over HTTP not secure?

Because HTTP sends data in plain text without encryption, anyone intercepting the data can read it, as shown in steps 2 and 4 of the execution_table.

What extra step does HTTPS add compared to HTTP?

HTTPS establishes an encrypted connection before sending data, shown between steps 6 and 7 in the execution_table, ensuring data privacy.

Does HTTPS change how the server processes requests?

No, the server processes requests the same way, but the data is encrypted during transfer, as seen in steps 9 and 10.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does encryption start in HTTPS?

A Step 7

B Step 2

C Step 4

D Step 10

💡 Hint

Check the 'Security' column in the execution_table for when 'Encryption started' appears.

According to variable_tracker, what is the state of 'Response Data' after the HTTP response?

A Encrypted received

B Empty

C Plain text received

D Displayed

💡 Hint

Look at the 'After HTTP Response' column for 'Response Data' in variable_tracker.

If the connection security variable stayed 'None' during HTTPS steps, what would that mean?

A Data is encrypted

B Data is not encrypted

C Server is offline

D Browser crashed

💡 Hint

Refer to 'Connection Security' row in variable_tracker and what 'None' means.

Concept Snapshot

HTTP sends data in plain text without encryption.
HTTPS adds encryption for secure data transfer.
Browser sends request, server responds, browser displays page.
HTTPS includes a secure handshake before data exchange.
Use HTTPS to protect sensitive information online.

Full Transcript

This visual execution shows how HTTP and HTTPS work when you visit a website. First, the user types a URL. The browser sends a request to the server. With HTTP, data is sent in plain text, so it is not secure. The server processes the request and sends back a response, also in plain text. The browser then shows the webpage. With HTTPS, before sending data, the browser and server create a secure encrypted connection. Then, all data sent and received is encrypted, protecting it from being read by others. The server processes requests the same way, but the data is safe during transfer. This helps keep your information private when browsing the web.