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Web Technology

admin 17 June 2026

Introduction

Modern web technology enables communication between users’ devices and remote servers over the Internet. Every time you open a browser and visit a website, you are interacting with a distributed system of applications, APIs, databases, and cloud services working together in real time.

For example, when you search for a book on a site like Amazon, your browser sends a request to remote servers, which process your query, retrieve results, and return a dynamic web page.

Client–Server Architecture

Web systems are built on a client–server model:

Client

The client is the user-facing application:

  • Web browsers (Chrome, Edge, Firefox, Safari)
  • Mobile apps (iOS/Android)
  • Desktop applications using web APIs

The client is responsible for:

  • Sending requests
  • Rendering content (HTML/CSS/JavaScript)
  • Handling user interactions

Server

The server processes requests and provides responses.

Modern servers may include:

  • Web servers (Nginx, Apache)
  • Application servers (Node.js, Spring Boot, Django)
  • Cloud services (AWS, Azure, Google Cloud)
  • Microservices architectures

Servers handle:

  • Business logic
  • Authentication
  • Database queries
  • API responses
  • File delivery

How Web Communication Works

When a user performs a search:

  1. Browser sends an HTTP request
  2. Server processes the request
  3. Server queries databases or APIs
  4. Server generates a response (often JSON or HTML)
  5. Browser renders the result

This interaction is typically done using:

  • HTTP (HyperText Transfer Protocol)
  • HTTPS (secure HTTP using encryption via TLS)

HTTP vs HTTPS (Modern View)

Protocol

Description

HTTP

Unencrypted communication

HTTPS

Encrypted communication using TLS

Modern reality:

Today, HTTPS is mandatory for almost all websites due to:

  • Data privacy
  • Authentication security
  • Search engine ranking benefits
  • Regulatory compliance

Frontend vs Backend (Modern Terminology)

Web applications are now commonly divided into:

Frontend (Client-Side)

Runs in the browser.

Technologies include:

  • HTML (structure)
  • CSS (styling)
  • JavaScript (logic)
  • Modern frameworks:
    • React
    • Angular
    • Vue.js
    • Svelte

Frontend responsibilities:

  • UI rendering
  • User interaction
  • API communication
  • State management

Backend (Server-Side)

Runs on servers or cloud infrastructure.

Technologies include:

  • Node.js
  • Python (Django, Flask, FastAPI)
  • Java (Spring Boot)
  • C# (.NET)
  • Go (Gin, Fiber)

Backend responsibilities:

  • Business logic
  • Database operations
  • Authentication/authorization
  • API generation (REST/GraphQL)

Web APIs and Modern Communication

Modern web systems rely heavily on APIs.

Common API styles:

  • REST APIs (most common)
  • GraphQL APIs (flexible queries)
  • gRPC (high-performance microservices communication)

Example:

Instead of returning full HTML pages, servers often return:

  • JSON data
  • XML (less common today)

GET vs POST (Modern Usage)

Web forms and APIs use HTTP methods:

GET

  • Used to retrieve data
  • Data sent in URL parameters
  • Cached by browsers

Example:

GET /search?q=laptops

POST

  • Used to send data to server
  • Data sent in request body
  • Used for forms, authentication, uploads

Example:

POST /checkout

Modern addition:

Other HTTP methods are widely used:

  • PUT (update)
  • DELETE (remove)
  • PATCH (partial update)

Web Documents and HTML

Web pages are built using HTML (HyperText Markup Language).

HTML allows:

  • Structuring content
  • Embedding links
  • Including images, videos, forms

Example:

<h1>Welcome</h1> <p>This is a web page.</p>

Modern Web Pages

Today’s websites are no longer static documents. They are:

  • Dynamic applications (Single Page Applications - SPA)
  • Component-based systems
  • API-driven interfaces

Modern frameworks generate HTML dynamically in the browser.

Head and Body (HTML Structure)

Every HTML document has:

Head

Contains metadata:

  • Page title
  • Stylesheets
  • Scripts
  • SEO information

Body

Contains visible content:

  • Text
  • Images
  • Buttons
  • Layout components

Modern Web Architecture

Modern web systems often use:

1. Cloud Infrastructure

  • AWS, Azure, Google Cloud
  • Auto-scaling servers
  • Load balancers

2. Microservices

Applications are split into smaller services:

  • Authentication service
  • Payment service
  • Search service

3. Containers

  • Docker
  • Kubernetes

These allow scalable deployment and portability.

Modern Web Technologies

Frontend Ecosystem

  • React
  • Next.js
  • Angular
  • Vue

Backend Ecosystem

  • Node.js + Express
  • Django / FastAPI
  • Spring Boot
  • .NET Core

Databases

  • PostgreSQL
  • MySQL
  • MongoDB (NoSQL)
  • Redis (cache)

Web Security (Modern Importance)

Modern web systems must secure:

  • User authentication (OAuth2, OpenID Connect)
  • Data encryption (TLS/HTTPS)
  • API security (JWT tokens)
  • Protection against attacks:
    • SQL injection
    • XSS (Cross-site scripting)
    • CSRF (Cross-site request forgery)

Web Standards and Organizations

Key organizations include:

  • W3C (World Wide Web Consortium) → web standards
  • WHATWG → HTML Living Standard
  • IETF → Internet protocols (HTTP, TLS)
  • ECMA International → JavaScript standard (ECMAScript)

Modern Web Development Stack (Example)

A typical modern web application stack:

  • Frontend: React + TypeScript
  • Backend: Node.js (Express)
  • Database: PostgreSQL
  • Hosting: AWS / Azure
  • Deployment: Docker + Kubernetes
  • API: REST or GraphQL

Summary

Web technology has evolved from simple client-server page delivery into a highly dynamic ecosystem of cloud-based services, APIs, and interactive applications. Modern web systems are:

  • Distributed
  • Secure
  • API-driven
  • Cloud-native
  • Highly scalable

Despite this evolution, the core idea remains the same:

A client requests information, and a server processes and responds—now at global scale with advanced technologies.

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