curl_getinfo返回-1作为content-length [英] curl_getinfo returning -1 as content-length

问题描述

我正在建立网站抓取工具，并使用 cURL class ，这些选项用于获取标题，以便我可以提取它们的 mime / type 和 content-length



<$ p>这些是我的curl选项

  $ c-> setopt（CURLOPT_URL，$ theURL）; 
 $ c-> setopt（CURLOPT_HEADER，false）; 
 $ c-> setopt（CURLOPT_RETURNTRANSFER，true）; 
 $ c-> setopt（CURLOPT_TIMEOUT，10）; 
 $ c-> setopt（CURLOPT_CONNECTTIMEOUT，10）; 
 $ c-> setopt（CURLOPT_NOBODY，TRUE）; 
 $ c-> setopt（CURLOPT_FOLLOWLOCATION，TRUE）; 
 $ c-> setopt（CURLOPT_MAXREDIRS，2）; 
 
 //在类内
 $ theReturnValue = curl_exec（$ this-> m_handle）; 
 $ this-> m_status = curl_getinfo（$ this-> m_handle）; 
  

但总是返回 [download_content_length] =>

CURLOPT_NOBODY >解决方案

CURLINFO_CONTENT_LENGTH_DOWNLOAD （这是PHP绑定使用的）说：

如果大小不知道， p>

I am building a website crawler and using a cURL class with these options for getting headers, so that I can extract their mime/type and content-length before downloading full site to very it as text/html and below specified size limits.

these are my curl options

$c->setopt(CURLOPT_URL, $theURL);
$c->setopt(CURLOPT_HEADER, false);
$c->setopt(CURLOPT_RETURNTRANSFER, true);
$c->setopt(CURLOPT_TIMEOUT, 10);
$c->setopt(CURLOPT_CONNECTTIMEOUT, 10);
$c->setopt(CURLOPT_NOBODY, TRUE);
$c->setopt(CURLOPT_FOLLOWLOCATION, TRUE);
$c->setopt(CURLOPT_MAXREDIRS, 2);

// Within Class
$theReturnValue = curl_exec($this->m_handle);
$this->m_status = curl_getinfo($this->m_handle) ;

but it always return [download_content_length] => -1 even without CURLOPT_NOBODY however the data (whole file) retrived is correct.

解决方案

The libcurl docs for CURLINFO_CONTENT_LENGTH_DOWNLOAD (which is what the PHP binding is using) says:

"this returns -1 if the size isn't known"

这篇关于curl_getinfo返回-1作为content-length的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！