Lambda Integrations

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Lambda support 3 types invocation:

1. RequestResponse (Default Type): Invoke the function synchronously. Keeps the connection open until the function return response or times out. The API response contains response, data and status
2. Event: Invoke the function asynchronously. Returns a response code not the response data. We can configure a DLQ (Dead letter queue) to investigate the failure
3. DryRun: Validate parameter and verify roles and permissions

We can integrate lambda with API gateway by proxy and non-proxy,

Proxy: Redirect all the params, payloads, headers etc directly to the Lambda from api gateway.

non-proxy: We need to map all the params, payloads etc.