Golang keep alive

I have the following go code:

package main

import (
   "net/http"
    "github.com/labstack/echo"
)
func main() {
e := echo.New()
e.POST("/getRequestData", respond)
e.Logger.Fatal(e.Start(":80"))
}

func respond(c echo.Context) error {

        resp := map[string]string{ "value": "key"}
        return c.JSON(http.StatusOK, resp)
}

I want that connections toward this server will be open up to 10 min of inactivity. What I see that every few minutes I get Ack from the server, which causes it to remain open indefinitely. How do I turn off keep-Alive in go?

Thanks.