/**
* 下载远程 HTTP 请求内容。
*
* @param string $url
* @param HTTPOption $option
* @param array $info
* @return string
* @throws ArgumentException
*/
private function _download($url, $option, &$info)
{
if (!$option) {
throw new ArgumentException('必须指定 HTTPOption 参数对象。', -1);
}
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $option->getConnectTimeout());
curl_setopt($ch, CURLOPT_TIMEOUT, $option->getTimeout());
curl_setopt($ch, CURLOPT_DNS_CACHE_TIMEOUT, $option->getDnsCacheTimeout());
curl_setopt($ch, CURLOPT_USERAGENT, $option->getUserAgent());
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$pfs = $option->getPostFields();
if (false !== $pfs) {
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $pfs);
}
if ($option->getOnProgress() != NULL) {
curl_setopt($ch, CURLOPT_NOPROGRESS, false);
curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, $option->getOnProgress());
}
if ($option->getCookies()) {
curl_setopt($ch, CURLOPT_COOKIE, $option->getCookies());
}
if ($option->getProxyHost()) {
curl_setopt($ch, CURLOPT_PROXY, $option->getProxyHost());
}
$content = curl_exec($ch);
if (!curl_errno($ch)) {
$info = curl_getinfo($ch);
}
curl_close($ch);
return $content;
}