Go server

package main

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

func ServeFile(w http.ResponseWriter, req *http.Request) {
  w.Header().Set("Strict-Transport-Security","max-age=315360000")
  address := req.Host
  parts := strings.Split(address,".")
  subdomain := parts[0]
  if subdomain == "www" && address !="www.domain.tld" {
    parts[0] = ""
    //io.WriteString(w,strings.Join(parts,"."))
    http.Redirect(w,req,"https://" + strings.TrimLeft(strings.Join(parts,".") + req.RequestURI,"."),http.StatusMovedPermanently)
  } else {
    if address == "domain.tld" {
      subdomain = "www"
    }
    path := "html/" + subdomain + req.RequestURI
    stat, err := os.Stat(path)
    if err==nil {
      if stat.IsDir() {
        if !strings.HasSuffix(path,"/") {
          path = path + "/"
        }
        stat,err := os.Stat(path + "index.gparse")
        if err==nil {
          path = path + "index.gparse"
        } else {
          path = path + "index.html"
        }
      }
      if strings.HasSuffix(path,".gparse") {
        //need that code here
      } else {
        content, err := ioutil.ReadFile(path)
        if err != nil {
          fmt.Println(err)
        } else {
          //io.WriteString(w,req.Host)
          io.WriteString(w,string(content))
        }
      }
    } else {
      w.WriteHeader(http.StatusNotFound)
      io.WriteString(w,"404 Not found! You are at: " + req.Host)
    }
  }
}

func RedToHttps(w http.ResponseWriter, req *http.Request) {
  http.Redirect(w,req,"https://" + req.Host + req.RequestURI, http.StatusMovedPermanently)
}

func main() {
  http.HandleFunc("/",ServeFile)
  go http.ListenAndServeTLS(":443","cert.pem","privkey.pem",nil)
  http.ListenAndServe(":80",http.HandlerFunc(RedToHttps))
}