Lesson 52/100

Tutorials AWS Cloud Tutorial

API Gateway — Complete Guide

API Gateway — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of AWS Cloud Tutorial on Toolliyo Academy.

8 min read Updated 8/22/2026

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AWS Cloud Tutorial · Lesson 52 of 100

API Gateway

Core services ✓ → Projects

Projects · 2 — Deploy · ~6 min · AWS — Serverless & Event-Driven

What is this?

Amazon API Gateway exposes REST, HTTP, and WebSocket APIs with auth, throttling, and integration to Lambda, HTTP backends, or AWS services.

Why should you care?

AwsVerse mobile banking app calls HTTP APIs with JWT authorizers and usage plans per partner.

See it live — copy this example

Run in AWS CloudShell / local AWS CLI v2, or follow the matching steps in the AWS Console (Free Tier).

aws apigatewayv2 create-api \
  --name awsverse-payments-http \
  --protocol-type HTTP \
  --target arn:aws:lambda:ap-south-1:123:function:payment-handler

What happened?

Creates an HTTP API with Lambda proxy integration.
Add routes, stages, and custom domain for production traffic.

Practice next

Create HTTP API with Lambda integration.
Add route POST /pay.
Test: curl https://api-id.execute-api.region.amazonaws.com/pay.
Add JWT authorizer on protected routes.
Enable access logging to CloudWatch.

Remember

API Gateway = managed API front door. HTTP API is cheaper for Lambda. Usage plans throttle tenants.

AwsVerse partner API

Fintech partners need sandbox keys.

Outcome: Usage plan caps 1000 req/sec per API key with burst control.

Interview prep for this lesson

Practice these questions aloud after reading—each links to a full structured answer.

Junior Detailed

Explain Services in the context of AWS Cloud.

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Services…

What are common mistakes teams make with Deployment when using AWS Cloud?

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Deploymen…

Senior Detailed

How would you debug a production issue related to Security in a AWS Cloud application?

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Security…

Junior Detailed

Describe a real-world scenario where Monitoring mattered in a AWS Cloud project.

Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Monitorin…

All course Q&A Practice exams

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