Curl php is not working [closed]

I'm using php curl on the server.

function getSite($url){
    $ch = curl_init(); 
    curl_setopt($ch,CURLOPT_URL,$url);  
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    echo curl_error($ch);
    $output = curl_exec($ch);
    curl_close($ch);   
    echo $output;
}

getSite("http://www.google.com.br");
getSite("http://www.planalto.gov.br/ccivil_03/Constituicao/Constituicao.htm");

The google site works perfectly but the upland site does not. In localhost the 2 works. What could be happening? The 2 sites are external but only one works (the link of the site of the plateau is correct but neither error of the curl shows) Thank you in advance.