App Engine - 无法导航到其他页面

App Engine - 无法导航到其他页面

应用程序.yaml

runtime: php81
entrypoint: serve role.php
env: standard

handlers:
- url: /logo.png
static_files: logo.png
upload: logo.png

角色.php

<!DOCTYPE html>
<html>
<head>
<title>Buy On Behalf</title>
</head>
<body>
<div class="container">
<h1>Buy On Behalf</h1>
<img src="logo.png" alt="Buy On Behalf">
<a href="seller_mainpage.php" class="button">Seller</a>
<a href="buyer_mainpage.php" class="button">Buyer</a>
</div>
</body>
</html>

卖家主页.php

<!DOCTYPE html>
<html>
<head>
<title>Buy On Behalf</title>
</head>
<body>
<div class="container">
<h1>Buy On Behalf - SELLER</h1>
<img src="logo.png" alt="Buy On Behalf">
<a href="seller_registration.html" class="button">Register</a>
<a href="seller_login.html" class="button">Login</a>
<a href="role.php">Back</a>
</div>
</body>
</html>

目前,我可以导航到 role.php,但是,为什么单击按钮时无法导航到 seller_mainpage.php?上面的 URL 已经改变,但界面没有改变。

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