Signing requests with Cognito token to API Gateway necessary?

Question

I have an application that uses Cognito for authentication. I also use API Gateway. I read [here](https://docs.aws.amazon.com/general/latest/gr/signing_aws_api_requests.html) that

> 
The AWS SDKs, AWS Command Line Interface (AWS CLI), and other AWS tools sign API requests for you using the access key that you specify when you configure the tool. When you use these tools, you don’t need to learn how to sign API requests

So if I'm making fetch requests to API Gateway, is it still necessary to manually sign these requests with the tokens from Cognito? Or is there a way around that?

Answer

No, when using API Gateway with a Cognito authorizer it is not needed.  The token should just be placed in the Authorization header. Signing is used when calling AWS APIs or when using the IAM Authorizer in API Gateway. The signing is done using a mechanism called SigV4.

Signing requests with Cognito token to API Gateway necessary?

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