added some changes related to the advices i gathered from cozy forum

main.go

@@ -19,15 +19,15 @@ func main() {
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		query := r.URL.Query()
 		fmt.Println(query)
-		host := strings.Split(query.Get("state"), "-")[0]
+		host := strings.Split(query.Get("state"), "-")[1]
 		fmt.Println(host)
-		state := query.Get("state")
+		state := strings.Split(query.Get("state"), "-")[0]
 		fmt.Println(state)
 		usagePointId := query.Get("usage_point_id")
 		fmt.Println(usagePointId)
 		code := query.Get("code")
 		fmt.Println(code)
-		redir := "http://" + host + "?code=" + code + "?state="+ state +"&usage_point_id=" + usagePointId
+		redir := "https://" + host + "?code=" + code + "&state="+ state +"&usage_point_id=" + usagePointId
 		fmt.Println(redir)
 		http.Redirect(w, r, redir, 302)
 	})