set some default headers

server.go

@@ -9,8 +9,25 @@ import (
 	"path/filepath"
 )
 
+func setContentType(w http.ResponseWriter, ext string) {
+	var t string
+	switch ext {
+	case ".html":
+		t = "text/html"
+	case ".js":
+		t = "text/javascript"
+	default:
+		t = ""
+	}
+	if t != "" {
+		w.Header().Add("Content-Type", t)
+	}
+}
+
 func viewHandler(root string, w http.ResponseWriter, r *http.Request) {
-	file := filepath.Join(root, filepath.FromSlash(r.URL.Path[1:]))
+	relativePath := filepath.FromSlash(r.URL.Path[1:])
+	file := filepath.Join(root, relativePath)
+	setContentType(w, filepath.Ext(relativePath))
 	info, err := os.Stat(file)
 	if err != nil {
 		fmt.Fprint(w, err)