How to use an AWS Lambda Java function to call a third party REST API?

Question

I want to know how the AWS API Gateway calls third party REST APIs using authorization.

Also, how can I write an AWS Lambda Java function that will call multiple third party REST APIs and merge responses which will send to API Gateway?

It's just normal code -- call the 3rd-party API how you normally would. — John Rotenstein

Ritisha - AWS Ritisha - AWS · Accepted Answer · 2017-05-04T22:53:19

API Gateway provides three kinds of Authorizers today:

IAM auth - Use policies to provide permissions to roles and users within your AWS account.
Custom Authorizers - Call a Lambda function which handles authorization.
Cognito User Pools - Authorize members of a Cognito User Pool to access your API.

You can setup an HTTP integration which calls the third-party APIs and authorize calls using one of the above.

Thanks! Ritisha