file_upgrade_insecure_loopback_form.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>Bug 1661423 - don't apply upgrade-insecure-requests on form submissions to localhost</title>

</head>

<body>

<form id="form" action="http://127.0.0.1/bug-1661423-dont-upgrade-localhost">

  <input type="submit">

</form>>

<script type="text/javascript">

    form.submit();

</script>

</body>

</html>