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chromium
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chromium/third_party/blink/web_tests/http/tests/navigation/resources/redirect-reload.html 

<html>
<script type="text/javascript" src="testcode.js"></script>
<body>
<form id="testform" action="postresult.pl" method="post">
<input type="submit" name="submitwithpostredirectreload" value="Submit with POST followed by a redirect + reload"/><br>
</form>
</body>
</html>