NSS Curl 400 Issue

<?php

$t1 = 'https://alice.sni.velox.ch';
$t2 = 'https://carol.sni.velox.ch';

function build_handle($url)
{
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_ENCODING, "");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, true);
    curl_setopt($ch, CURLOPT_FORBID_REUSE, true);
    curl_setopt($ch, CURLOPT_FRESH_CONNECT, true);

    return $ch;
}

$alice = build_handle($t1);
$response = curl_exec($alice);
curl_close($alice);
echo "\n------------- Alice: -----------\n";
echo "$t1\n";
echo substr($response, 0, strpos($response, "\r\n\r\n"));

$carol = build_handle($t2);
$response = curl_exec($carol);
curl_close($carol);
echo "\n------------- Carol: -----------\n";
echo "$t2\n";
echo substr($response, 0, strpos($response, "\r\n\r\n"));


$carol = build_handle($t2);
$response = curl_exec($carol);
curl_close($carol);
echo "\n------------- Carol 2: -----------\n";
echo "$t2\n";
echo substr($response, 0, strpos($response, "\r\n\r\n"));