问cURL使用命令行成功，但使用php curl_exec实现504网关超时？

EN

function sendRequest($url, $data, $token = '') {
    $header[] = "Connection: keep-alive";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, 'CURL_HTTP_VERSION_1_1');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_VERBOSE, true);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36");

    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}

curl --url "http://x.x.x.x" --header "Connection: keep-alive" --http1.1 --verbose --request "POST" -d "data1=value1" -d "data2=value2" --user-agent "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36"