รบกวนผู้รู้ค่ะ เราทำฟอร์ม login ผ่านโปรแกรม netbeans พอรันหน้าเว็บ ใส่username,passwordกด login ให้ลิ้งไปหน้าถัดไป ปัญหาคือมันแจ้ง error แบบนี้ค่ะ

ตัวอย่างโค้ดนะคะ
index.html
<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body id="body-color">
<div id="Sign-In">
<fieldset style="width:30%"><legend>LOG-IN HERE</legend>
<form method="POST" action="vv.html">
User <br>
<input type="text" name="user" size="40"><br> Password <br>
<input type="password" name="pass" size="40"><br>
<input id="button" type="submit" name="submit" value="Log-In">
</form> </fieldset> </div> </body>
</html>
------------------------------------------------
vv.html
<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>TODO write content</div>
</body>
</html>
----------------------------------------------
ติดปัญหา ERR_EMPTY_RESPONSE
ตัวอย่างโค้ดนะคะ
index.html
<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body id="body-color">
<div id="Sign-In">
<fieldset style="width:30%"><legend>LOG-IN HERE</legend>
<form method="POST" action="vv.html">
User <br>
<input type="text" name="user" size="40"><br> Password <br>
<input type="password" name="pass" size="40"><br>
<input id="button" type="submit" name="submit" value="Log-In">
</form> </fieldset> </div> </body>
</html>
------------------------------------------------
vv.html
<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>TODO write content</div>
</body>
</html>
----------------------------------------------