YouTube video: https://youtu.be/O1PgqUqZKTA?si=zWZFt9soFZb4js98

This document explores the fundamental architectures of REST (Request/Response) and Message Queue (Publish/Subscribe), comparing their models, use cases, pros, and cons. It is designed to help software engineers and system architects understand each approach in-depth, especially within complex, distributed, or microservices-based systems.

Table of Contents

1. Basic Concepts of Request/Response and Publish/Subscribe
2. Request/Response Model: How It Works and Its Limitations
3. Example: Uploading and Processing Videos Via Request/Response
4. Challenges and Complexity in Request/Response Architecture
5. Publish/Subscribe Architecture Explained
6. Example: Uploading and Processing Videos Using Pub/Sub
7. Technical Details: Message Delivery, Subscriptions, and Communication
8. Pros and Cons of Publish/Subscribe Architecture
9. Message Delivery Challenges
10. Summary and Key Takeaways

1. Basic Concepts of Request/Response and Publish/Subscribe

• REST as HTTP Request/Response:

  REST is fundamentally a simple HTTP-based protocol where a client sends a request, and the server responds with data. It uses synchronous communication by default.

• Message Queue as Publish/Subscribe:

  Message queues follow a publish/subscribe pattern where services publish messages to a "topic" or "channel" and other services (subscribers) consume these messages asynchronously.