Content-Length Header missing?

[the_]

Hi,

I try to download some (binary) from a server. The request page is a php script, that returns the files according some POST variables.

my php script looks like this

<?php
//read $_POST and do some PDO things returning content as blob, size as int, contenttype as varchar
$filesize = $res['size']; //size is set in the database
$type = $res['contenttype'];
$content = $res['content'];
header("Content-Length: $filesize");
header("Content-type: $type");
echo $content;
?>

If I request a file via browser (with jquery post), I get all headers, but with QNetworkAccessManager I am missing the Content-Length.

qDebug() << "header: " << r->header(QNetworkRequest::ContentLengthHeader);

says QVariant(Invalid)

qDebug() << r->rawHeaderList();

reads this:

("Date", "Server", "X-Powered-By", "Vary", "Content-Encoding", "Connection", "Transfer-Encoding", "Content-Type")

Any ideas what went wrong here?