embed templates in binary

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"embed"
 	"encoding/json"
 	"fmt"
 	"html/template"
@@ -27,6 +28,9 @@ type contextKey string
 
 const netAddrKey = contextKey("netAddr")
 
+//go:embed templates/*
+var templatesFS embed.FS
+
 func RealIpMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		netAddr := extractNetAddress(r)
@@ -85,7 +89,7 @@ func mainHandler(w http.ResponseWriter, r *http.Request) {
 		switch r.URL.Path {
 		case "/":
 			fp := path.Join("templates", "index.html")
-			tmpl, err := template.ParseFiles(fp)
+			tmpl, err := template.ParseFS(templatesFS, fp)
 			if err != nil {
 				http.Error(w, err.Error(), http.StatusInternalServerError)
 				return