API Gateway with Spring Boot: Deep Dive with Interview Questions

A Comprehensive Guide

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Imagine you’re traveling for a long-awaited vacation. You arrive at the airport, but before boarding your flight, you need to go through the check-in counter.

Why?

Because the check-in counter acts as a single point of entry, handling multiple responsibilities like Identity Verification, Baggage Handling, Security Checks, Load Management, Upgrades & Special Services etc.

Now, imagine an airport without a check-in system — people rushing straight to planes, incorrect luggage on flights, security risks, and complete chaos.

That’s exactly what happens in a microservices system without an API Gateway — uncontrolled access, security issues, and inefficient communication.

API Gateway is a crucial component in modern application architecture, especially in microservices, cloud computing, and distributed systems.

Now, let’s dive into why API Gateways are essential, how they work, and how to implement one using Spring Boot.

Definition