title: PHP CURL - Empty output with no error
body: <p>I am not getting the curl output for valid url,
  sample $url= <a href="http://linkedin.com/pub/4/b29/8a0" rel="noreferrer">http://linkedin.com/pub/4/b29/8a0</a></p>
  
  <pre><code>$ch = curl_init();
  
  curl_setopt($ch, CURLOPT_URL,           "$url");
  curl_setopt($ch, CURLOPT_TIMEOUT,       60);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
  
  $referer = WebCrawl::getRandomURL();
  curl_setopt($ch, CURLOPT_REFERER,       $referer);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
  curl_setopt($ch, CURLOPT_COOKIEJAR,     "cookie.txt");
  
  curl_setopt($ch, CURLOPT_USERAGENT,     "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)");
  
  $body = curl_exec($ch);
  $error_no = curl_errno($ch);
  </code></pre>