Complete HTTP from a Developer’s Perspective: Understanding the Foundation of the Modern Web

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Complete HTTP from a Developer’s Perspective

Understanding the Foundation of the Modern Web

Introduction

Every website, web application, mobile application, cloud platform, API, IoT device, and microservice ecosystem depends on one fundamental protocol:

HTTP (HyperText Transfer Protocol).

Whether a user opens a webpage, clicks a button, submits a form, watches a video, uploads a file, or calls an API, HTTP is working behind the scenes.

Many developers use HTTP every day but only understand a small portion of its capabilities. Modern software engineering requires much deeper knowledge.

A professional developer should understand:

How HTTP works internally
Request-response architecture
HTTP methods
Status codes
Headers
Cookies
Sessions
Authentication
Authorization
Caching
Security
Performance optimization
REST APIs
HTTP/2
HTTP/3
CDN communication
Reverse proxies
Load balancers
Cloud-native architectures

This guide explains HTTP from a developer's perspective, focusing on practical knowledge used in real-world software development.

What is HTTP?

HTTP stands for:

HyperText Transfer Protocol

It is an application-layer protocol that allows communication between:

Clients
Servers

Examples:

Client	Server
Browser	Website
Mobile App	API Server
React App	Backend
Angular App	REST API
IoT Device	Cloud Service
Microservice	Another Microservice

HTTP defines:

How requests are sent
How responses are returned
How resources are identified
How data is transferred

Why HTTP Was Created

Before HTTP, information sharing across networks was difficult.

The invention of:

URLs
HTML
HTTP

created the World Wide Web.

HTTP became the communication language of the internet.

Today, HTTP powers:

Google
Amazon
Netflix
Facebook
LinkedIn
GitHub
Cloud Platforms
SaaS Applications

HTTP Communication Model

The basic model is:

Client
   |
   | HTTP Request
   v
Server
   |
   | HTTP Response
   v
Client

Example:

Browser
   |
GET /products
   |
   v
Server
   |
200 OK
Products Data
   |
   v
Browser

HTTP Request Lifecycle

When a user enters:

https://example.com/products

many operations occur.

Step 1: DNS Resolution

Browser asks:

Where is example.com?

DNS returns:

192.168.10.20

Step 2: TCP Connection

Browser establishes:

TCP Connection

with the server.

Step 3: TLS Handshake

For HTTPS:

TLS Handshake

occurs.

Purpose:

Encryption
Authentication
Secure communication

Step 4: HTTP Request

Browser sends:

GET /products HTTP/1.1
Host: example.com

Step 5: Server Processing

Server:

Receives request
Executes business logic
Queries database
Generates response

Step 6: HTTP Response

HTTP/1.1 200 OK

<html>
...
</html>

Step 7: Browser Rendering

Browser:

Parses HTML
Downloads CSS
Downloads JavaScript
Renders page

Stateless Nature of HTTP

One of the most important concepts.

HTTP is:

Stateless

Meaning:

Each request is independent.

Example:

Request 1:

GET /home

Request 2:

GET /profile

Server does not automatically remember previous requests.

Because of this limitation:

Cookies were created
Sessions were introduced
JWT tokens emerged

HTTP Message Structure

An HTTP message contains:

Request

GET /users HTTP/1.1
Host: example.com
Authorization: Bearer token

Body

Components:

Method
URL
Version
Headers
Body

Response

HTTP/1.1 200 OK
Content-Type: application/json

{
"id":1
}

Components:

Status Line
Headers
Body

Understanding URLs

URL means:

Uniform Resource Locator

Example:

https://example.com/products/10?sort=asc

Components:

Protocol
Host
Path
Query Parameters

Breakdown:

https://

Protocol

example.com

Domain

/ products / 10

Path

?sort=asc

Query Parameter

URI vs URL

Developers often confuse them.

URI

Uniform Resource Identifier

Identifies resource.

Example:

/users/100

URL

Uniform Resource Locator

Identifies and locates resource.

Example:

https://example.com/users/100

Every URL is a URI.

Not every URI is a URL.

HTTP Methods

Methods define actions.

GET

Retrieve data.

Example:

GET /products

Usage:

Fetch products
Fetch users
Fetch orders

Should not modify data.

POST

Create data.

Example:

POST /users

Body:

{
"name":"John"
}

Creates new record.

PUT

Replace resource.

Example:

PUT /users/1

Entire object replaced.

PATCH

Partial update.

Example:

PATCH /users/1

{
"email":"new@email.com"
}

Only specified fields updated.

DELETE

Remove resource.

Example:

DELETE /users/1

Deletes record.

HEAD

Same as GET.

Returns:

Headers only

No body.

Useful for:

Health checks
Resource validation

OPTIONS

Returns supported operations.

Example:

OPTIONS /users

Response:

GET
POST
PUT
DELETE

Commonly used in:

CORS

TRACE

Used for diagnostics.

Rarely used in production.

Often disabled for security reasons.

CONNECT

Used by proxies.

Creates network tunnel.

Important in HTTPS communication.

Safe Methods

Safe means:

No server-side modifications.

Examples:

GET
HEAD
OPTIONS
TRACE

Idempotent Methods

Multiple executions produce same result.

Examples:

GET
PUT
DELETE
HEAD
OPTIONS

Example:

DELETE /user/10

Calling multiple times leaves resource deleted.

Non-Idempotent Methods

Examples:

POST

Calling repeatedly:

POST /orders

creates multiple orders.

HTTP Status Codes

Status codes indicate outcome.

Structure:

1xx
2xx
3xx
4xx
5xx

1xx Informational Responses

Temporary responses.

Example:

100 Continue
101 Switching Protocols

Rarely encountered directly.

2xx Success Responses

Request successful.

Common codes:

200 OK
201 Created
202 Accepted
204 No Content

200 OK

Most common response.

200 OK

Request completed successfully.

201 Created

Used after creation.

POST /users

Response:

201 Created

202 Accepted

Processing will occur later.

Common in:

Background jobs
Queue systems

204 No Content

Success with no response body.

Example:

DELETE /users/5

3xx Redirection Responses

Resource moved.

Examples:

301
302
307
308

301 Moved Permanently

SEO-friendly redirect.

Old URL
→ New URL

Search engines update indexing.

302 Found

Temporary redirect.

Search engines typically retain original URL.

307 Temporary Redirect

Preserves HTTP method.

Important for APIs.

308 Permanent Redirect

Permanent version of 307.

Preserves request method.

Part 3 — HTTPS, TLS, CORS, REST APIs, Content Negotiation, File Uploads, and API Design

In Part 2, we covered:

4xx and 5xx Status Codes
HTTP Headers
Cookies
Sessions
Authentication
Authorization
JWT
OAuth 2.0
OpenID Connect

Now we move into the security and API engineering aspects of HTTP that every modern developer must understand.

Why HTTPS Exists

HTTP by itself is not secure.

Traditional HTTP transmits data as plain text.

Example:

POST /login HTTP/1.1

username=john
password=secret123

An attacker monitoring network traffic could read:

username=john
password=secret123

This creates serious security risks.

Examples:

Password theft
Credit card theft
Session hijacking
Data tampering
Identity theft

To solve these problems:

HTTPS = HTTP + TLS

was introduced.

What is HTTPS?

HTTPS stands for:

HyperText Transfer Protocol Secure

It uses:

TLS (Transport Layer Security)

to encrypt communication.

Architecture:

Browser
|
Encrypted HTTPS
|
Web Server

Without the encryption key:

Data Cannot Be Read

even if intercepted.

HTTP vs HTTPS

Feature	HTTP	HTTPS
Encryption	No	Yes
Security	Low	High
Authentication	No	Yes
SEO Ranking	Lower	Higher
Browser Trust	No	Yes
Modern Standards	Not Recommended	Recommended

Understanding TLS

TLS stands for:

Transport Layer Security

TLS provides:

Confidentiality
Integrity
Authentication

Confidentiality

Confidentiality means:

Only sender and receiver can read data.

Example:

Password
Bank Data
Medical Records
Personal Information

remain encrypted.

Integrity

Integrity means:

Data was not modified during transit.

Example:

Original:

Transfer ₹100

Modified by attacker:

Transfer ₹100000

TLS detects tampering.

Authentication

Authentication ensures:

You are talking to the real server.

Example:

google.com

instead of:

fake-google.com

TLS Handshake Overview

Before HTTP communication begins:

TLS Handshake

occurs.

Simplified TLS Flow

Browser
   ↓
Client Hello
   ↓
Server Hello
   ↓
Certificate Exchange
   ↓
Key Exchange
   ↓
Secure Connection Established

Only after this process:

HTTP Requests Begin

Client Hello

Browser sends:

Supported TLS Versions
Supported Cipher Suites
Random Number

Example:

TLS 1.2
TLS 1.3
AES256
CHACHA20

Server Hello

Server responds with:

Selected TLS Version
Selected Cipher
Server Random Number

Certificate Exchange

Server sends:

SSL/TLS Certificate

Example:

CN=example.com

Certificate contains:

Domain name
Public key
Expiration date
Issuer

Key Exchange

Browser verifies certificate.

Both sides create:

Session Key

used for encryption.

Secure Communication Begins

Now HTTP traffic becomes:

Encrypted HTTPS Traffic

instead of readable text.

SSL vs TLS

Many developers still say:

SSL Certificate

Technically:

SSL = Obsolete
TLS = Modern Standard

Today:

SSL 2.0 → Dead
SSL 3.0 → Dead
TLS 1.0 → Deprecated
TLS 1.1 → Deprecated
TLS 1.2 → Common
TLS 1.3 → Recommended

Digital Certificates

Certificates prove server identity.

Example:

https://example.com

Certificate verifies:

This server owns example.com

Certificate Components

Contains:

Domain
Public Key
Issuer
Expiration Date
Signature

Certificate Authorities (CA)

Certificate Authorities issue certificates.

Examples:

Let's Encrypt
DigiCert
GlobalSign

Browsers trust these authorities.

Self-Signed Certificates

Developer-generated certificates.

Useful for:

Development
Testing
Internal Systems

Not recommended for public websites.

Browsers display warnings.

HSTS

HSTS means:

HTTP Strict Transport Security

Header:

Strict-Transport-Security:
max-age=31536000

Purpose:

Force HTTPS Usage

Prevents downgrade attacks.

Same-Origin Policy

Modern browsers enforce:

Same-Origin Policy

Origin consists of:

Protocol
Domain
Port

Example:

https://app.company.com

Different origin:

https://api.company.com

because hostname differs.

What is CORS?

CORS means:

Cross-Origin Resource Sharing

Allows controlled cross-domain communication.

Why CORS Exists

Imagine:

evil.com

trying to call:

bank.com

using your browser.

Without protection:

Security Disaster

would occur.

Example CORS Scenario

Frontend:

https://app.company.com

Backend:

https://api.company.com

Browser sends:

Origin: https://app.company.com

Server decides whether access is allowed.

Access-Control-Allow-Origin

Example:

Access-Control-Allow-Origin:
https://app.company.com

Allowed.

Example:

Access-Control-Allow-Origin: *

Anyone allowed.

Use carefully.

Preflight Requests

Certain requests trigger:

OPTIONS Request

before actual request.

Example:

OPTIONS /users

Browser asks:

May I send this request?

Server replies:

Access-Control-Allow-Methods:
GET, POST, PUT

Common CORS Headers

Allow Origin

Access-Control-Allow-Origin

Allow Methods

Access-Control-Allow-Methods

Allow Headers

Access-Control-Allow-Headers

Allow Credentials

Access-Control-Allow-Credentials

REST API Fundamentals

Modern HTTP APIs are largely REST-based.

REST stands for:

Representational State Transfer

Introduced by:

Roy Fielding

REST Principles

A REST API should be:

Stateless
Scalable
Cacheable
Resource-Oriented
Uniform

Resource-Oriented Design

Bad:

/getAllUsers
/createUser
/deleteUser

Good:

GET /users
POST /users
DELETE /users/1

Resources should be nouns.

REST Endpoint Examples

Users:

GET /users
GET /users/5
POST /users
PUT /users/5
DELETE /users/5

Orders:

GET /orders
POST /orders

Products:

GET /products
GET /products/100

REST Request Example

POST /users

Content-Type: application/json

{
"name":"John",
"email":"john@email.com"
}

REST Response Example

201 Created

{
"id":101,
"name":"John",
"email":"john@email.com"
}

REST Naming Standards

Use:

/users
/orders
/products

Avoid:

/getUsers
/fetchOrders
/deleteProduct

HTTP methods already define actions.

Query Parameters

Filtering:

GET /products?category=laptop

Pagination:

GET /products?page=2

Sorting:

GET /products?sort=price

Searching:

GET /products?search=dell

API Versioning

As APIs evolve:

Breaking Changes Occur

Versioning becomes necessary.

URL Versioning

Most common:

/api/v1/users
/api/v2/users

Header Versioning

Example:

API-Version: 2

Content Negotiation Versioning

Example:

Accept:
application/vnd.company.v2+json

Content Negotiation

Allows clients to request preferred formats.

Accept Header

Client:

Accept: application/json

Response:

{
"message":"success"
}

Client:

Accept: application/xml

Response:

<message>success</message>

Content-Type vs Accept

Header	Purpose
Content-Type	Format Sent
Accept	Format Expected

Example:

POST /users

Content-Type: application/json
Accept: application/xml

Meaning:

Sending JSON
Expecting XML

MIME Types

Common MIME Types:

Type	MIME
JSON	application/json
XML	application/xml
HTML	text/html
CSS	text/css
JavaScript	application/javascript
PNG	image/png
JPEG	image/jpeg
PDF	application/pdf
ZIP	application/zip

File Uploads

File uploads use:

multipart/form-data

Example Upload Request

POST /upload

Content-Type:
multipart/form-data

Contains:

File
Metadata
Additional Fields

Multipart Form Structure

Boundary
↓
Field 1
Boundary
↓
Field 2
Boundary
↓
File
Boundary End

Upload Best Practices

Validate:

File Size
MIME Type
Extension
Virus Scan
Filename

Secure Upload Example

Accept:

PDF
DOCX
PNG
JPG

Reject:

Executable Files
Scripts
Malware

File Download Responses

Example:

Content-Type: application/pdf
Content-Disposition: attachment

Browser downloads file.

Range Requests

Useful for:

Video Streaming
Large Downloads
Resume Downloads

Example:

Range: bytes=0-1000

Server returns:

206 Partial Content

API Error Response Standards

Poor Example:

{
"error":"failed"
}

Better Example:

{
"code":"USER_NOT_FOUND",
"message":"User not found",
"timestamp":"2026-01-01T10:00:00Z"
}

Standard API Response Pattern

Success:

{
"success": true,
"data": {}
}

Error:

{
"success": false,
"error": {}
}

Enterprise API Design Guidelines

Always:

Use HTTPS
Validate inputs
Use proper status codes
Implement authentication
Implement authorization
Support pagination
Rate limit requests
Log requests
Monitor performance
Version APIs

Avoid:

Exposing internal errors
Returning stack traces
Inconsistent naming
Huge payloads
Breaking changes

Richardson Maturity Model

Levels of REST maturity:

Level 0

Single endpoint.

POST /api

Level 1

Resources introduced.

/users
/orders

Level 2

Uses HTTP methods correctly.

GET
POST
PUT
DELETE

Level 3

Hypermedia (HATEOAS).

Responses contain navigation links.

Highest REST maturity level.

Part 4 — Caching, Reverse Proxies, Load Balancers, API Gateways, HTTP/2, HTTP/3, CDNs, and Performance Optimization

In Part 3, we covered:

HTTPS
TLS
Certificates
CORS
REST APIs
Content Negotiation
File Uploads
API Versioning

Now we move into one of the most important areas of modern software engineering:

HTTP Performance, Scalability, and Enterprise Infrastructure.

These concepts are used daily in:

Large-scale websites
SaaS platforms
Cloud-native applications
Microservices
Enterprise APIs
Streaming platforms
E-commerce systems

Why HTTP Performance Matters

Imagine a website receives:

10 users/second

The server performs well.

Now imagine:

100,000 users/second

The same design may fail.

Common problems:

High latency
Slow API responses
Database bottlenecks
Excessive bandwidth usage
Infrastructure overload

Performance optimization begins with understanding HTTP caching.

HTTP Caching Fundamentals

Caching means:

Store a copy of data
so it doesn't need to be regenerated.

Without caching:

Client
↓
Server
↓
Database

Every request reaches the database.

With caching:

Client
↓
Cache
↓
Response

Database load decreases dramatically.

Benefits of Caching

Caching improves:

Speed
Scalability
Availability
User experience

Reduces:

CPU usage
Memory usage
Network traffic
Database load

Types of HTTP Caching

Modern systems use multiple layers.

Browser Cache
Proxy Cache
CDN Cache
Application Cache
Database Cache

Browser Cache

Most common cache layer.

Example:

logo.png
styles.css
app.js

After first download:

Stored in Browser

Subsequent requests:

Served Locally

No server request required.

Cache-Control Header

Most important caching header.

Example:

Cache-Control: max-age=3600

Meaning:

Cache for 1 hour

Common Cache-Control Directives

max-age

Cache-Control: max-age=3600

Valid for:

3600 seconds

no-cache

Cache-Control: no-cache

Must revalidate before use.

no-store

Cache-Control: no-store

Never store data.

Used for:

Banking
Healthcare
Sensitive information

public

Cache-Control: public

Anyone may cache.

private

Cache-Control: private

Only browser may cache.

Expires Header

Older caching mechanism.

Example:

Expires:
Wed, 01 Jan 2027 00:00:00 GMT

Defines exact expiration date.

Today:

Cache-Control

is preferred.

ETag

ETag means:

Entity Tag

Represents resource version.

Example:

ETag: "v123456"

Why ETags Exist

Without ETags:

Download File
Again
Again
Again

Large bandwidth consumption.

With ETags:

Ask:
Has file changed?

Server checks version.

Conditional Requests

Client sends:

If-None-Match: "v123456"

Server compares.

If unchanged:

304 Not Modified

No content transferred.

Huge performance gain.

Last-Modified Header

Alternative validation mechanism.

Example:

Last-Modified:
Mon, 01 Jun 2026 10:00:00 GMT

Client later sends:

If-Modified-Since:
Mon, 01 Jun 2026 10:00:00 GMT

304 Not Modified

Very important response code.

Meaning:

Use cached copy.

Benefits:

Lower bandwidth
Faster responses
Reduced server load

Cache Hierarchy

Real-world enterprise caching:

Browser
↓
CDN
↓
Reverse Proxy
↓
Application Cache
↓
Database

Every layer improves scalability.

Content Delivery Networks (CDN)

A CDN stores content close to users.

Examples:

Cloudflare
Akamai Technologies
Amazon Web Services
Microsoft

Traditional Hosting

Without CDN:

User (India)
↓
USA Server

High latency.

CDN Architecture

User
↓
Nearest CDN Node
↓
Origin Server

Benefits:

Faster delivery
Reduced latency
Better scalability

CDN Cached Content

Typically:

Images
Videos
CSS
JavaScript
Fonts
PDFs

Sometimes:

API Responses

CDN Cache Hit

Best scenario:

User
↓
CDN
↓
Response

Origin server not contacted.

CDN Cache Miss

User
↓
CDN
↓
Origin Server
↓
Response

CDN stores copy for future requests.

Reverse Proxy Fundamentals

A reverse proxy sits between:

Client
↓
Reverse Proxy
↓
Application Server

Clients never communicate directly with applications.

Popular Reverse Proxies

Examples:

NGINX
HAProxy
Apache HTTP Server
Traefik

Reverse Proxy Responsibilities

SSL termination
Request routing
Caching
Compression
Security filtering
Rate limiting

SSL Termination

Instead of every server handling TLS:

Client
↓ HTTPS
Reverse Proxy
↓ HTTP
Application

Reduces application complexity.

Load Balancing Fundamentals

Single server:

100,000 Users
↓
1 Server

Potential bottleneck.

Load balancing distributes traffic.

Load Balancer Architecture

Users
↓
Load Balancer
↓ ↓ ↓
S1 S2 S3

Traffic distributed across servers.

Benefits

High availability
Scalability
Fault tolerance
Better performance

Load Balancing Algorithms

Round Robin

Request 1 → Server A
Request 2 → Server B
Request 3 → Server C

Simple and common.

Weighted Round Robin

More powerful servers receive more requests.

Example:

Server A = Weight 10
Server B = Weight 5

Least Connections

Requests go to:

Server with fewest active connections

Useful for uneven workloads.

IP Hash

Same client consistently reaches same server.

Useful for:

Session Persistence

Health Checks

Load balancer continuously verifies:

Server Healthy?

Example:

GET /health

If unhealthy:

Traffic Removed

API Gateways

Microservice environments often use API gateways.

Architecture:

Client
↓
API Gateway
↓
Microservices

API Gateway Responsibilities

Authentication
Authorization
Routing
Rate Limiting
Monitoring
Logging
Caching

Popular API Gateways

Examples:

Kong Gateway
Apigee
Amazon API Gateway
Azure API Management

HTTP Compression

Responses often contain:

HTML
JSON
CSS
JavaScript

Compression reduces payload size.

Gzip Compression

Traditional standard.

Example:

100 KB JSON

Compressed:

20 KB

Approximately 80% reduction.

Brotli Compression

Modern alternative.

Advantages:

Better compression ratio
Smaller payloads
Faster page loads

Widely supported by browsers.

Compression Negotiation

Client sends:

Accept-Encoding:
gzip, br

Server chooses:

Content-Encoding: br

HTTP Keep-Alive

Without Keep-Alive:

Request
Open Connection

Response
Close Connection

Repeated continuously.

Expensive.

Keep-Alive Connection

Connection reused:

Open Once
Use Many Times

Benefits:

Reduced latency
Reduced TCP overhead
Better performance

HTTP Pipelining

HTTP/1.1 introduced pipelining.

Goal:

Multiple Requests
Single Connection

Limitations prevented widespread adoption.

Eventually replaced by HTTP/2.

HTTP/1.1 Limitations

Major problems:

Head-of-line blocking
Multiple TCP connections
Large latency
Inefficient resource loading

These issues motivated HTTP/2.

HTTP/2 Overview

Released to improve performance.

Major features:

Multiplexing
Header compression
Stream prioritization
Single connection

HTTP/2 Multiplexing

HTTP/1.1:

Connection 1 → Request 1
Connection 2 → Request 2
Connection 3 → Request 3

HTTP/2:

Single Connection
↓
Many Streams

Huge performance improvement.

Header Compression

HTTP headers often repeat.

Example:

Authorization
Cookie
Accept

Repeated thousands of times.

HTTP/2 compresses headers using:

HPACK

Reducing bandwidth.

Stream Prioritization

Browser may prioritize:

Critical CSS

before:

Images
Ads
Videos

Improving rendering speed.

HTTP/3 Overview

Newest HTTP generation.

Built on:

QUIC

instead of TCP.

Why HTTP/3 Was Created

TCP introduces delays when packets are lost.

HTTP/3 solves many latency issues.

Benefits:

Faster connections
Better mobile performance
Reduced latency
Improved reliability

QUIC Protocol

Developed by:

Google

Runs on:

UDP

instead of TCP.

HTTP Evolution

HTTP/1.0
    ↓
HTTP/1.1
    ↓
HTTP/2
    ↓
HTTP/3

Each generation improves:

Speed
Efficiency
Scalability

Performance Optimization Checklist

Always:

✅ Enable HTTPS

✅ Use HTTP/2 or HTTP/3

✅ Enable Brotli

✅ Use CDN

✅ Configure caching

✅ Use ETags

✅ Compress images

✅ Minify CSS

✅ Minify JavaScript

✅ Reduce payload sizes

✅ Enable Keep-Alive

✅ Monitor latency

Enterprise HTTP Architecture

Typical enterprise flow:

User
↓
DNS
↓
CDN
↓
WAF
↓
Load Balancer
↓
Reverse Proxy
↓
API Gateway
↓
Microservices
↓
Redis Cache
↓
Database

This architecture can support:

Millions of Users
Millions of Requests
Global Scale

Cloud-Native HTTP Communication

Modern cloud systems rely heavily on HTTP.

Examples:

Frontend → API
API → Service
Service → Service
Service → Gateway
Gateway → Cloud Platform

HTTP remains the dominant protocol for distributed systems.

Part 5 — Microservices, Security, Monitoring, Debugging, Production Operations, and the HTTP Mastery Roadmap

This final part brings together everything required to understand HTTP at an enterprise and cloud-native level.

By the end, you should understand not only how HTTP works, but how it is used in:

Enterprise applications
Cloud platforms
SaaS products
DevOps environments
API ecosystems
Global-scale distributed systems

HTTP in Modern Microservices

Traditional applications:

Frontend
↓
Monolithic Application
↓
Database

Modern applications:

Frontend
↓
API Gateway
↓
User Service
Order Service
Product Service
Payment Service
Notification Service

Every service communicates using HTTP or HTTPS.

Service-to-Service Communication

Example:

Order Service
↓
User Service

Request:

GET /users/1001

Response:

{
"id":1001,
"name":"John"
}

This communication happens thousands of times per second.

Synchronous Communication

Traditional HTTP communication is synchronous.

Client
↓
Request
↓
Wait
↓
Response

Advantages:

Simple
Easy debugging
Immediate response

Disadvantages:

Blocking
Dependency on service availability

Asynchronous Communication

Alternative pattern:

Service A
↓
Message Queue
↓
Service B

Examples:

Order Processing
Email Sending
Notification Systems

Common technologies:

Apache Kafka
RabbitMQ
Amazon Simple Queue Service

Service Discovery

In cloud environments:

Server IPs Change Frequently

Hardcoded addresses become problematic.

Example:

User Service
10.1.1.5

Tomorrow:

10.1.1.20

Service discovery solves this problem.

Service Registry Architecture

Service Registry
      ↑
      |
Microservices Register
      |
      ↓
Clients Discover Services

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