Request and response mapping in AWS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is request mapping in AWS API Gateway?

Request mapping is the process of transforming the incoming client request data into a format that the backend service can understand.

beginner

What does response mapping do in AWS API Gateway?

Response mapping transforms the backend service response into a format suitable for the client before sending it back.

intermediate

Which language is commonly used for request and response mapping templates in AWS API Gateway?

Velocity Template Language (VTL) is used to write mapping templates for transforming requests and responses.

intermediate

Why is request and response mapping important in API Gateway?

It allows you to adapt client requests and backend responses without changing backend code, enabling flexibility and integration.

advanced

Give an example of a simple request mapping template in AWS API Gateway.

A simple request mapping template might extract a JSON field like: {"userId": "$input.path('$.id')"} to send only the userId to the backend.

What language is used to write AWS API Gateway mapping templates?

A Velocity Template Language (VTL)

B Python

C JavaScript

D JSON Schema

AWS API Gateway uses Velocity Template Language (VTL) for request and response mapping templates.

What is the main purpose of response mapping in API Gateway?

A Transform backend response to client format

B Validate client request

C Encrypt backend data

D Route requests to backend

Response mapping changes backend responses into a format suitable for the client.

Which AWS service commonly uses request and response mapping templates?

A EC2

B S3

C API Gateway

D CloudWatch

API Gateway uses mapping templates to transform requests and responses.

What can you do with request mapping in API Gateway?

A Monitor backend logs

B Store data in S3

C Scale backend servers

D Change client request format before sending to backend

Request mapping modifies the client request to match backend expectations.

Which of these is NOT a benefit of using request and response mapping?

A Flexibility in data formats

B Changing backend code automatically

C Separation of client and backend concerns

D Easier integration with different clients

Mapping templates do not change backend code; they transform data formats.

Explain how request and response mapping works in AWS API Gateway and why it is useful.

Think about how data changes between client and backend.

Describe a simple example of a request mapping template in AWS API Gateway.

Consider how you pick data from client request to send to backend.