Thank you very much McA for the example.

However when I tried this in my code, it seems the ASP sessionID is still missing in the cookie.

What's more, the response was an html page instead of the real data that it should be.

The web page it access seems needs two parts in the cookie, one is the ASP sessionID, the other is the mail address like thing as you could see from the cookie content.

Is the cookie not correctly accept when I put it into the GET request?

 345         $dl_res = $ua->request(
 346             GET $req_url,
 347             Cookie => 'ASP.NET_SessionId=xaduwqpg5ocnenpb0l0xsq4d
+; GMProfileInfo=e=xxxx@banana.com'
 348         );
[download]

The real request it sent by looking from the debugger (the ASP Session
+ID is not showing up but it should):

'_request' => bless( {
       '_content' => '',
       '_uri' => bless( do{\(my $o = 'http://www.xxxx.xxx/pages/profil
+e.aspx/pages/profile.aspx?src=http://xxxx.xxxx.xxx/protectedfiledownl
+oad.aspx?dlfile=data_bulk/file.txt')}, 'URI::http' ),
       '_headers' => bless( {
            'cookie2' => '$Version="1"',
            'user-agent' => 'libwww-perl/5.804',
            'cookie' => 'GMProfileInfo=e=xxxx@banana.com&i=536'
            }, 'HTTP::Headers' ),
       '_method' => 'GET'
}, 'HTTP::Request' )
[download]