public handleHeaderInfo(PHPCrawlerResponseHeader $header)
| $header | PHPCrawlerResponseHeader | The header as PHPCrawlerResponseHeader-object | 
| int | The document won't be received if you let this method return any negative value. | 
  
Everytime a header of a document was received, the crawler will call this method.
If this method returns any negative integer, the crawler will NOT reveice the content of the particular page or file.
Example:class MyCrawler extends PHPCrawler 
  
{
  function handleHeaderInfo(PHPCrawlerResponseHeader $header)
  {
    // If the content-type of the document isn't "text/html" -> don't receive it.
    if ($header->content_type != "text/html")
    {
      return -1;
    }   
  }
  function handleDocumentInfo($PageInfo)
  {
    // ...
  }
}