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chromium/third_party/blink/web_tests/http/tests/eventsource/eventsource-csp-redirect.html 

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy"
      content="connect-src http://127.0.0.1:8000/js-test-resources/js-test.js http://127.0.0.1:8000/resources/redirect.php">
<script src="/js-test-resources/js-test.js"></script>
<script src="script-tests/eventsource-csp-redirect.php"></script>
</head>
</html>