Manually sign AppSync URL to use in Lambda gives bad signature error

Question

In a Lambda, I would like to sign my AppSync endpoint with aws-signature-v4 in order to use it for a mutation.

The URL generated se

Answer 1

You don't need to construct a pre-signed URL to call an AWS AppSync endpoint. Set the authentication mode on the AppSync endpoint to AWS_IAM, grant permissions to your Lambda execution role, and then follow the steps in the "Building a JavaScript Client" tutorial to invoke a mutation or query.