index.html 的默認301或者302跳轉
<!DOCTYPE html>
<html>
<head>
<title>Google</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
<script>window.location.href='https://www.google.com';</script>
</head>
<body>
</body>