Convert port to :port of type string in Golang

Question

How do you convert a port inputted as a int by the user to a string of type ":port" (ie, it should have a ':' in front of it and should be converted to string). The output has to be feed to http.ListenAndServe().

Answer 1

if err := http.ListenAndServe(fmt.Sprintf(":%d", port), handler); err != nil {
        log.Fatal(err)
}