Mayank Tripathi

Day 8: Web Basics – HTTPs, HTTP, DNS

Domain Name System

Domain Name System (DNS) is a critical component of the Internet’s infrastructure that translates human-friendly names, such as rtcamp.com, into IP addresses.

How DNS Works

  1. Querying: When you enter a domain name, your browser sends a query to a DNS server.
  2. Response: The DNS server responds with the corresponding IP address.
  3. Connection: Your browser then uses this IP address to connect to the website’s server.

Importance of DNS

  • User Convenience: Allows users to access websites using easy-to-remember domain names instead of complex numerical IP addresses.
  • Load Distribution: Enables the use of multiple servers to handle the traffic to a single domain name, improving reliability and performance.

What is HTTP?

Definition and Role

HTTP (Hypertext Transfer Protocol) is the foundation of data communication on the web. It defines how messages are formatted and transmitted, and how web servers and browsers should respond to various commands.

How HTTP Works

  1. Request: Your browser sends an HTTP request to a server when you try to access a webpage.
  2. Processing: The server processes the request and prepares an HTTP response.
  3. Response: The server sends back an HTTP response, which includes the requested resource (like an HTML page) and a status code.

Key Features of HTTP

  • Stateless: Each HTTP request is independent; the server does not retain any session information between requests.
  • Plaintext: Data sent via HTTP is not encrypted, making it vulnerable to interception.

Common HTTP Methods

  • GET: Requests data from a server.
  • POST: Submits data to be processed to a server.
  • PUT: Updates existing data on the server.
  • DELETE: Deletes specified data on the server.

What is HTTPS?

Definition and Role

HTTPS (Hypertext Transfer Protocol Secure) is an extension of HTTP that adds a layer of security. It uses SSL/TLS (Secure Sockets Layer/Transport Layer Security) to encrypt data transferred between a client (browser) and a server.

How HTTPS Works

  1. SSL/TLS Handshake: When you connect to an HTTPS site, your browser and the server perform a handshake to establish a secure connection.
  2. Encryption: Data transmitted over this connection is encrypted, ensuring that even if intercepted, it cannot be read by unauthorized parties.
  3. Authentication: The server provides a digital certificate to the browser, proving its identity and building trust.

Benefits of HTTPS

  • Security: Protects sensitive data, such as login credentials and payment information, from being intercepted.
  • Trust: Websites with HTTPS are often trusted more by users, as indicated by the padlock icon in the browser’s address bar.
  • SEO: Search engines like Google give preference to HTTPS sites, potentially improving your site’s ranking.

DNS, HTTP, and HTTPS in Action

Scenario: Accessing a Secure Website

  1. DNS Resolution: You type www.securewebsite.com into your browser. A DNS query is made, and the corresponding IP address is returned.
  2. HTTP/HTTPS Request: Your browser initiates an HTTPS request to the server at the returned IP address.
  3. SSL/TLS Handshake: The browser and server complete the SSL/TLS handshake, establishing a secure connection.
  4. Data Transfer: Encrypted data is exchanged between your browser and the server, ensuring privacy and security.


Thanks for reading…