Resources and methods in AWS - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

API Gateway Resource and Method Behavior

You create an API Gateway REST API with a resource path /items and add a GET method integrated with a Lambda function. What happens when a client sends a POST request to /items?

A The API Gateway returns a 405 Method Not Allowed error because POST method is not defined on the resource.

B The API Gateway forwards the POST request to the Lambda function configured for GET method.

C The API Gateway automatically creates a POST method and returns a 200 OK response.

D The API Gateway returns a 404 Not Found error because POST method is not supported.

💡 Hint

Think about how API Gateway handles HTTP methods that are not explicitly configured on a resource.

API Gateway only allows HTTP methods that are explicitly defined on a resource. If a client sends a request with an undefined method, API Gateway returns a 405 Method Not Allowed error.

❓ Architecture

intermediate

Designing Resources and Methods for Versioning

You want to design an API Gateway REST API that supports two versions: v1 and v2. Which resource structure best supports this versioning?

A Use a single resource <code>/api</code> and add a query parameter <code>version</code> to distinguish versions.

B Create two top-level resources: <code>/v1</code> and <code>/v2</code>, each with their own methods and integrations.

C Create one resource <code>/</code> and use different HTTP headers to specify the version.

D Create separate APIs for v1 and v2 instead of using resources.

💡 Hint

Consider how resource paths can represent different API versions clearly.

Using separate resource paths like /v1 and /v2 clearly separates versions and allows independent method configurations for each version.

❓ security

advanced

Securing Methods with IAM Authorization

You configure a POST method on a resource in API Gateway and set the authorization type to IAM. What must a client do to successfully invoke this method?

A Sign the request with AWS credentials using Signature Version 4 signing process.

B Include an API key in the request header.

C Send the request without any authentication; IAM authorization is automatic.

D Provide a valid OAuth 2.0 token in the Authorization header.

💡 Hint

Think about how IAM authorization works with API Gateway methods.

When IAM authorization is enabled, clients must sign their requests using AWS Signature Version 4 with valid AWS credentials to be authorized.

❓ Configuration

advanced

Configuring a Mock Integration Method

You want to create a GET method on a resource that returns a fixed JSON response without calling any backend. Which integration type should you configure?

A Set the integration type to HTTP and point to a dummy URL that returns the JSON.

B Set the integration type to AWS Service and call a service that returns the JSON.

C Set the integration type to MOCK and configure a method response with a static mapping template.

D Set the integration type to AWS Lambda and use a Lambda function that returns the JSON.

💡 Hint

Consider how to return a response directly from API Gateway without backend calls.

MOCK integration allows API Gateway to return a response directly using mapping templates without invoking any backend service.

✅ Best Practice

expert

Optimizing API Gateway Resource and Method Structure for Caching

You want to enable caching for a GET method on a resource but only cache responses when the query parameter type is present. How should you configure caching keys?

A Enable caching on the method without specifying cache key parameters; all requests are cached.

B Caching cannot be configured based on query parameters in API Gateway.

C Enable caching and include all query string parameters as cache keys.

D Enable caching on the method and configure the cache key parameters to include <code>method.request.querystring.type</code> only.

💡 Hint

Think about how API Gateway cache keys can be customized to include specific request parameters.

API Gateway allows specifying which request parameters are used as cache keys. Including only method.request.querystring.type caches responses based on that parameter.