Ho corretto:
<html>
<head>
</head>
<body>
<form action="cgi-bin/led_on.cgi" method="post" target="forms_target">
<input type="submit" value="Led ON"/>
</form>
<form action="cgi-bin/led_off.cgi" method="post" target="forms_target">
<input type="submit" value="Led OFF"/>
</form>
<iframe src="about:blank" name="forms_target" style="display:none"> </iframe>
</body>
</html>
ma il risultato è lo stesso, ottengo sempre la pagina Bad Gateway

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