Graphql server in go with Graphiql handling one query

main.go

package main

import (
	"net/http"

	"github.com/friendsofgo/graphiql"
	graphql "github.com/graph-gophers/graphql-go"
	"github.com/graph-gophers/graphql-go/relay"
)

type query struct{}

func (*query) Hello() string { return "Hello, world!" }

func main() {
	s := `
			type Query {
					hello: String!
			}
        `
	schema := graphql.MustParseSchema(s, &query{})

	graphiqlHandler, err := graphiql.NewGraphiqlHandler("/graphql")
	if err != nil {
		panic(err)
	}

	http.Handle("/graphql", &relay.Handler{Schema: schema})
	http.Handle("/graphiql", graphiqlHandler)
	http.ListenAndServe(":8080", nil)
}