失败 - 使用readfile（）和filesize（）导出数据时，Google Chrome中出现网络错误

Question

I am trying to export data from back-end using a PHP script (download.php).

A folder path issue has been kept me stuck as described in following cases :

Running my site on a sub-domain : softy.foo.com

Script file which executes on user clicking the export button :

download.php (Path : public_html/softy/warehouse/items/download.php)

Case 1 :

Created exportedfiles folder in same location as of download.php i.e. items/exportedfiles - RESULT : file downloads successfully

Case 2 :

Created exportedfiles folder outside items directory - RESULT : file downloads successfully

Case 3 :

Created exportedfiles folder in extreme outside path. i.e. inside public_html folder and I gave full path to readfile() as param - RESULT : file download fails -

The file first proceeds whole downloading in the Chrome downloads but at last when download completes it says :

Failed - Network error

(The above error appears in the Chrome downloads bar along with the size of file ex. : 31 KB)

download.php reads as below :

$FileName = 'itemlist.xls';

$Path = 'exportedfiles/'; //works

$Path = '../exportedfiles/'; //works

$Path = '/mydrive/foo/public_html/softy/exportedfiles/'; //fails



    header("Pragma: public"); // required

    header("Expires: 0");

    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");

    header("Cache-Control: private",false); // required for certain browsers 

    header("Content-Type: application/msexcel");

    header("Content-Disposition: attachment; filename=\"{$FileName}\";" );

    header("Content-Transfer-Encoding: binary");

    header("Content-Length: ".filesize($Path.$FileName)) ;


    readfile($Path."{$FileName}");