Error handling in Go functions

[mg98]

I have a function with runtime: go1.x and an HTTP event (API Gateway trigger).

This is how the implementation for the handler function looks in this case:

func Handler(req events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error)

This function is called in the main func:

func main() {
    lambda.Start(Handler)
}

So when the execution arrives at an error, I am returning something like this:

return events.APIGatewayProxyResponse{StatusCode: http.StatusBadRequest}, errors.New("missing signature")

What do I expect from this?

Requests fail with response code 400 and the message "missing signature".

What do I actually get?

Requests fail with response code 502 and the { "message": "Internal server error" }.

CloudWatch logs the following:

missing signature: errorString null

...which is also a strange output. It seems to output the type of the error (errorString) and whatever null stands for. Maybe it also makes sense to do it like that, I don't know. But what I want to say with this, in particular with the HTTP response, is that errors are not handled correctly for functions in Go.

[pgrzesik]

Hello @mg98 - as this is not related to the Framework, I'm moving it to "Discussions" - this tracker is intended for enhancement proposals and/or bug tracking.