Why API Gateway in front of Lambda

What this card says

Why do we need it?

Browsers should not hold AWS credentials or invent routing.

What is it?

API Gateway is the HTTPS front door: routes, auth, throttle, stages.

How to do it

Create an HTTP API, add a route, integrate Lambda, copy the invoke URL.

https://xxxx.execute-api…

Example

fetch(API+"/hello") from a static site hits Gateway, then Lambda.