Content header header from php is overwritten!

I am trying to understand why the Content-Length php header is being rewritten. This is demo.php

<?php
header("Content-Length: 21474836470");die;
?>

header selection request

curl -I http://someserver.com/demo.php
HTTP/1.1 200 OK
Date: Tue, 19 Jul 2011 13:44:11 GMT
Server: Apache/2.2.16 (Debian)
X-Powered-By: PHP/5.3.3-7+squeeze3
Content-Length: 2147483647
Cache-Control: must-revalidate
Content-Type: text/html; charset=UTF-8

See Content-Length? It is displayed at 2147483647 bytes, i.e. 2 GB.

Now, if you change demo.php, for example,

<?php
header("Dummy-header: 21474836470");die;
?>

the title is not overwritten.

HTTP/1.1 200 OK
Date: Tue, 19 Jul 2011 13:49:11 GMT
Server: Apache/2.2.16 (Debian)
X-Powered-By: PHP/5.3.3-7+squeeze3
Dummy-header: : 21474836470
Cache-Control: must-revalidate
Content-Type: text/html; charset=UTF-8

Download modules here

root@pat:/etc/apache2# ls /etc/apache2/mods-enabled/
alias.conf        authz_host.load  dav_fs.load    expires.load  php5.conf    reqtimeout.load  status.conf
alias.load        authz_user.load  dav.load       headers.load  php5.load    rewrite.load     status.load
auth_basic.load       autoindex.conf   dav_lock.load  mime.conf     proxy.conf   setenvif.conf
authn_file.load       autoindex.load   dir.conf       mime.load     proxy_http.load  setenvif.load
authz_default.load    cgi.load         dir.load       negotiation.conf  proxy.load   ssl.conf
authz_groupfile.load  dav_fs.conf      env.load       negotiation.load  reqtimeout.conf  ssl.load

Here is phpinfo (): http://pastehtml.com/view/b0z02p8zc.html

Apache supports files larger than 2 GB, since I have no problems with direct access to a large file:

curl -I http://www.someserver.com/somehugefile.zip (5.3 Gig)
HTTP/1.1 200 OK
Date: Tue, 19 Jul 2011 14:00:25 GMT
Server: Apache/2.2.16 (Debian)
Last-Modified: Fri, 15 Jul 2011 08:50:22 GMT
ETag: "301911-1548e4b11-4a817bd63ef80"
Accept-Ranges: bytes
Content-Length: 5713578769
Cache-Control: must-revalidate
Content-Type: application/zip

Here is uname -a

Linux pat.someserver.com 2.6.38.2-grsec-xxxx-grs-ipv6-32 #1 SMP Fri Apr 15 17:41:28 UTC 2011 i686 GNU/Linux

Hope someone can help!

amuses

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