simple http serve util to serve a single static file on a port

serve.go

package main

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

func handler(w http.ResponseWriter, req *http.Request, path string) {

	data, err := ioutil.ReadFile(path)
	check(err)

	w.Header().Set("Content-Type", "text/html")
	fmt.Fprintf(w, "%s", data)
}

func check(e error) {
	if e != nil {
		fmt.Printf("error: %s", e)
		os.Exit(2)
	}
}

func main() {

	port := os.Args[1]
	file := os.Args[2]

	if _, err := os.Stat(file); os.IsNotExist(err) {
		fmt.Printf("no such file or directory: %s\n", file)
		os.Exit(1)
	}

	fmt.Printf("Serving %s on http://localhost:%s\n", file, port)

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
			handler(w, r, file)
		})
	http.ListenAndServe(":"+port, nil)
}

while learning go I needed a simple way to serve a static file over http. Instead of running a webserver like apache or nginx with configuration etc. I just wanted something the easiest solution to host a single file on a specified port.