Read a serial and write on http

server.go

package main

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

func readSerial(w http.ResponseWriter, r *http.Request) {
	ser, err := os.Open("./COM9")
	if err != nil {
		print("ERRO AO ABRIR COM9")
		os.Exit(1)
	}
	buf := make([]byte, 4000)
	ser.Read(buf)
	w.Write(buf)
	ser.Close()

}

func main() {
	http.HandleFunc("/read", readSerial)
	http.ListenAndServe(":3001", nil)
}