weird http header problem with rlib_get_content_length

It looks like the php header function does not like the newline between 
Content-Type and Content-Length in PHP 5.16
if I do:

header(rlib_get_content_type($rlib), true);
rlib_spool($rlib);
rlib_free($rlib);

The header does not set correctly and PDF's are displayed as text in the 
browser

However:

$hh = rlib_get_content_type($rlib);
$cl = strpos($hh, 'Content-Length');
$ctype_string = substr($hh,0,$cl);
$clength_string = substr($hh, $cl);
header(trim($ctype_string), true);
header(trim($clength_string));
rlib_spool($rlib);
rlib_free($rlib);

It works fine!

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