Sending a cookie value with file download in perl - perl

Question

I've got a submit button on a webpage which performs a file download when clicked.
I'm trying to disable the submit after click (to prevent resubmit while the file is created server-side) then re=enable the submit button when the file is downloaded.
I've almost got it working by following the tutorial below, in short:
When download is clicked get current timestamp and store it in a
hidden field
Send the timestamp with the download request to the server
Server does the file processing
Server creates a cookie with the timestamp value sent from the client
in the original request
Server sends the cookie to the client along with the file to download
On the client if the cookie value matches the hidden field timestamp
the submit is re-enabled
Detecting file download in browser
The problem is that I can't seem to find a way to send the cookie value back to the client with the file download header, if I include set-cookie in the header it breaks the file download process.
Here's my current header, which works:
Content-disposition: attachment; filename=$file; Content-type: $type\n\n$content
If I do this it breaks:
Set-Cookie:$cookie; Content-disposition: attachment; filename=$file; Content-type: $type\n\n$content
I'm creating a cookie on the server with the timestamp value from the client using:
$cookie = CGI::Cookie->new(-name=>'fileDownloadToken',-value=>"$token_value");
Does anyone know how I should go about doing this, coding in Perl?

Answer 1

Ok, I think I've fixed it. Just in case anyone else comes up against this it appeared to be the format of the header, instead of using a single string:
print qq(Content-disposition: attachment; filename=$file; Content-type: $type\n\n$content)
I used this:
print $page->header(
-'cookie' => "$cookie",
-'Content-disposition' => "attachment; filename=\"$file\"",
-'Content-type' => $content
);