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chromium/chrome/test/data/extensions/platform_apps/url_handlers/xhr_downloader/target.html 

<!--
Copyright 2013 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
<body>
<div>I'm a page to be downloaded via XHR</div>
</body>
</html>