CustomHTTPProtocol/WebViewControllerHTML/error.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <title>Error</title>
</head>
<body>
<h1>Error Loading Page</h1>
<p>
URL: %@
<br>
Domain: %@
<br>
Code: %zd
</p>
</body>
</html>