1、准备登录的html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="icon" href="favicon.ico">
</head>
<body>
<!--提交的位置 点击提交按钮相当于请求了这个网址-->
<form action="http://127.0.0.1:9000/auth" method="get">
<input type="text" name="username" placeholder="username">
<input type="password" name="password" placeholder="password">
<button>提交</button>
</form>
</body>
</html>