answer to a tour of go exercise on http handlers(web servers) https://tour.golang.org/methods/14

http_handlers.go

package main
 
import (
    "fmt"
    "net/http"
)
 
type Mystring string

type Mystruct struct {
    Greeting string
    Punct    string
    Who      string
}

func (s Mystring) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, s)
}

func (s Mystruct) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, s.Greeting, s.Punct, s.Who)
}
 
func main() {   
    var cool_str Mystring
    cool_str = "I'm a frayed knot."

    var cool_struct Mystruct
    cool_struct =  Mystruct{"Hello", ":", "Gophers!"}
    
    // your http.Handle calls here
    http.Handle("/string", cool_str)
    http.Handle("/struct", cool_struct)
    http.ListenAndServe("localhost:4000", nil)
}