I am creating a handler in AWS lambda that returns a file for my Single Page Application(SPA). The function runs fast (couple of ms).But still I have to run it multiple times, almost simultaneously, and then they timeout. My timeout is 60 seconds. I think that has something to do with docker but I am not so sure. Is there something I can do?

Here is my code:pastebin.com/TdqAu3Gx! Even with other functions it takes mush more time to get the response, compared to the execution time.

EDIT:

After some time I published the front-end on Netlify. But after making some functions I encountered the same bug. The fowoling code works in aws sam local.

package main

import (
    "fmt"

    "github.com/aws/aws-lambda-go/events"

    "github.com/aws/aws-lambda-go/lambda"
)

type MyReq struct {
    Username string `json:"username"`
}

func handler(m events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    // log.Println(m.Username)

    fmt.Println("

", m.Body, "

")
    return events.APIGatewayProxyResponse{
        Body: m.Body,
    }, nil
}
func main() {
    lambda.Start(handler)
}

But does not work in the real was lambda. (It works but I get the full json as text for exaple headers are not set on response, but i can see them as text in the body). If I change events.APIGatewayProxyResponse and events.APIGatewayProxyRequest to MyRequest and a string respectively it works in lambda but timeouts in sam local. In my template.json under Resources I have :

"TestFunction": {
        "Type": "AWS::Serverless::Function",
        "Properties": {
            "CodeUri": "MY_BUCKET",
            "Handler": "testf",
            "Role": "My Lambda role",
            "Events": {
                "RegisterEvent": {
                    "Type": "Api",
                    "Properties": {
                        "Path": "/testf",
                        "Method": "POST"
                    }
                }
            }
        }
    }

How can I make the code work both on AWS Lambda and SAM Local? If someone has a working template of a sam app that works both on SAM and AWS and can open source it, I would be very thankful.