我正面临一种不寻常的卷曲行为。对于给定的页面,有时我得到 HTTP 响应代码为 200,有时我得到 0 作为 HTTP 响应代码。我无法理解此页面是否有效。如果您尝试给定的代码,请尝试至少 5-10 次,以便您看到差异。
function print_info()
{
$url = 'bart.no';
$arr = array(
'bart.no',
'bolandirekt.nu',
'ekompassen.com',
'ekompassen.nu',
);
foreach ($arr as $url)
{
echo "<br/>URL: " . $url;
$temp = str_replace(array("www.", "http://", "https://"), "", strtolower($url));
// From this array it will be decided which is to prepend
$pre_array = array("", "www.", "https://", "http://", "https://www.", "http://www.");
$status_code = array();
// For each Value Status will be stored
foreach ($pre_array as $pre)
{
$options = array(
CURLOPT_RETURNTRANSFER => TRUE, // return web page
CURLOPT_HEADER => TRUE, // don't return headers
CURLOPT_FOLLOWLOCATION => FALSE, // follow redirects
CURLOPT_ENCODING => "", // handle all encodings
CURLOPT_USERAGENT => "spider", // who am i
CURLOPT_AUTOREFERER => FALSE, // set referer on redirect
CURLOPT_SSL_VERIFYHOST => FALSE, //ssl verify host
CURLOPT_SSL_VERIFYPEER => FALSE, //ssl verify peer
CURLOPT_NOBODY => FALSE,
CURLOPT_CONNECTTIMEOUT => 20, // timeout on connect
CURLOPT_TIMEOUT => 20, // timeout on response
);
// Initializing Curl
$ch = curl_init($pre . $temp);
// Set Curl Options
curl_setopt_array($ch, $options);
// Execute Curl
$content = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
echo "<pre/>";
if ($code == 200)
{
print_r(curl_getinfo($ch));
break;
}
curl_close($ch);
}
}
}
所以我的最后一个疑问是:为什么我会为不存在或未在浏览器中打开的页面获得响应代码 200?另外,即使我保持请求之间的时间间隔,为什么有时我会得到同一页面的响应代码 0 和有时响应代码 200?