Golang Mock Server

Server.go

package main

import (
        "fmt"
        "io/ioutil"
        "log"
        "net/http"
)

func main() {
        http.HandleFunc("/", handler)

        fmt.Printf("Starting mock server powered by Golang on localhost:5050\n")
        if err := http.ListenAndServe(":5050", nil); err != nil {
                log.Fatal(err)
        }
}

func handler(w http.ResponseWriter, r *http.Request) {
        if r.URL.Path != "/" {
                http.Error(w, "404 not found.", http.StatusNotFound)
                return
        }

        switch r.Method {
        case "GET":
                w.WriteHeader(http.StatusOK)
                _, _ = w.Write([]byte(`Called GET`))
        case "POST":
                w.WriteHeader(http.StatusOK)
                body, _ := ioutil.ReadAll(r.Body)
                println(string(body))
                _, _ = w.Write(body)
        default:
                w.WriteHeader(http.StatusMethodNotAllowed)
                _, _ = fmt.Fprintf(w, "Sorry, only GET and POST methods are supported.")
        }
}