Description:
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The Content-Disposition-Header in the 9. (grey) example box is wrong:

// It will be called downloaded.pdf
header("Content-Disposition: attachment; filename=downloaded.pdf");

// should be:
header('Content-Disposition: attachment; filename="downloaded.pdf"');

RFC 2616 (HTTP/1.1), Chapter 19.5.1:
content-disposition = "Content-Disposition" ":"
                              disposition-type 
[..]
filename-parm = "filename" "=" quoted-string