public/soundcloud_oauth_callback.html
<!DOCTYPE html>
<html lang="en">
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Connect with SoundCloud</title>
</head>
<body onload="window.opener.setTimeout(window.opener.SC.connectCallback, 1)">
<b style="width: 100%; text-align: center;">This popup should automatically close in a few seconds</b>
</body>
</html>