php 卷曲，跟随位置但只获取新位置的标题？
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Curl, follow location but only get header of the new location?
提问by Richard Knop
I know that when I set CURLOPT_FOLLOWLOCATION to true, cURL will follow the Location header and redirect to new page. But is it possible only to get header of the new page without actually redirecting there? Or is it not possible?
我知道当我将 CURLOPT_FOLLOWLOCATION 设置为 true 时，cURL 将跟随位置标头并重定向到新页面。但是是否有可能只获取新页面的标题而不实际重定向到那里？或者不可能？
回答by Nathan Dunn
Appears to be a duplicate of PHP cURL: Get target of redirect, without following it
似乎是PHP cURL的副本：获取重定向的目标，但不遵循它
However, this can be done in 3 easy steps:
但是，这可以通过 3 个简单的步骤完成：
Step 1. Initialise curl
步骤 1. 初始化 curl
curl_init($ch); //initialise the curl handle
//COOKIESESSION is optional, use if you want to keep cookies in memory
curl_setopt($ch, CURLOPT_COOKIESESSION, true);
Step 2. Get the headers for $url
步骤 2. 获取标题 $url
curl_setopt($ch, CURLOPT_URL, $url); //specify your URL
curl_setopt($ch, CURLOPT_HEADER, true); //include headers in http data
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false); //don't follow redirects
$http_data = curl_exec($ch); //hit the $url
$curl_info = curl_getinfo($ch);
$headers = substr($http_data, 0, $curl_info["header_size"]); //split out header
Step 3. Parse the headers to get the new URL
步骤 3. 解析标头以获取新 URL
preg_match("!\r\n(?:Location|URI): *(.*?) *\r\n!", $headers, $matches);
$url = $matches[1];
Once you have the new URL you can then repeat steps 2-3 as often as you like.
获得新 URL 后，您可以随时重复步骤 2-3。
回答by Marc B
No. You'd have to disable FOLLOWLOCATION, extract the redirect URL from the response, and then issue a new HEAD request with that URL.
不。您必须禁用FOLLOWLOCATION，从响应中提取重定向 URL，然后使用该 URL 发出新的 HEAD 请求。
回答by Ahmed Soliman
Yes, you can set it to follow the redirect until you get the last location on the header response.
是的，您可以将其设置为跟随重定向，直到获得标头响应的最后一个位置。
The function to get the last redirect:
获取最后一次重定向的函数：
function get_redirect_final_target($url)
{
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1); // follow redirects
curl_setopt($ch, CURLOPT_AUTOREFERER, 1); // set referer on redirect
curl_setopt($ch,CURLOPT_HEADER,false); // if you want to print the header response change false to true
$response = curl_exec($ch);
$target = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
curl_close($ch);
if ($target)
return $target; // the location you want
return false;
}
回答by fvox
Set CURLOPT_FOLLOWLOCATIONas falseand CURLOPT_HEADERas true, and get the "Location" from the response header.
设置CURLOPT_FOLLOWLOCATIONasfalse和CURLOPT_HEADERas true，并从响应头中获取“位置”。
回答by azat
And for analyze headers, your can use CURLOPT_HEADERFUNCTION
对于分析标题，您可以使用CURLOPT_HEADERFUNCTION
回答by shacharsol
Make sure you set CURLOPT_HEADERto True to get the headers in the response, otherwise the response returned as blank string
确保设置CURLOPT_HEADER为 True 以获取响应中的标头，否则响应以空字符串形式返回
回答by ctrlbrk
You can get the redirect URL directly with curl_getinfo:
可以通过 curl_getinfo 直接获取重定向 URL：
$ch = curl_init();
curl_setopt($ch, CURLOPT_COOKIESESSION, false);
curl_setopt($ch, CURLOPT_URL, $url); //specify your URL
curl_setopt($ch, CURLOPT_HEADER, true); //include headers in http data
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false); //don't follow redirects
$http_data = curl_exec($ch); //hit the $url
$redirect = curl_getinfo($ch)['redirect_url'];
curl_close($ch);
return $redirect;
