First, install aws-lambda-go:

go get github.com/aws/aws-lambda-go/lambda

Build and package locally:

go mod init lambda-test
go build main.go && zip function.zip main

Then upload function.zip to AWS by command line or web console, whichever you like. The handler name is main in this case.

Create a test and run a test in AWS Lambda web console, then you can see: