Method integration validation

[joni3k]

If API Gateway is generated from openapi, an integration is required for every method. Currently the error message from AWS is "No integration defined for method (Service: ApiGateway, Status Code: 400, Request ID: xxx), which is not helpful.

For now, at least some kind of validation should happen when generating the integrations. A good-to-have optional feature would be to generate a mock-integration for missing integrations.

[aripalo]

Agreed.

Maybe we could actually extend the mock integration concept and have a defaultIntegration prop where one could assign any kind of supported integration that would be assigned to paths without any integration?

This would tackle 2 different use cases:

• During development one could setup a mock integration for non-implemented methods while building the API setup
• If all API methods is handled by let's say external HTTP(S) endpoint or a Lambda proxy, then defining only one defaultIntegration would handle everything without having to explicitly define all paths and methods in CDK