http server

Fill in the blanks in line A and B, to respond to any http requests on port 8000 with response "hello"

package main
import (
    "fmt"
    "net/http"
)
func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
        ___ //A
    })
    // B
}

Answer

package main
import (
    "fmt"
    "net/http"
)
func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
        fmt.Fprintf(w, "hello")
    })
    http.ListenAndServe(":8000", mux)
}