I'm trying to figure why the Content-Length header of php gets overwritten. This is demo.php
<?php
header("Content-Length: 21474836470");die;
?>
a request to fetch the headers
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 maxes out at 2147483647 bytes, that is 2GB.
Now if modify demo.php like so
<?php
header("Dummy-header: 21474836470");die;
?>
the header 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
Here are the modules loaded
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 a phpinfo() : http://pastehtml.com/view/b0z02p8zc.html
Apache does support files over 2GB, as I don't have any problem accessing large file directly :
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 a 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 somebody can help !
cheers
Seems like php cast Content-length to int
Yes it's certainly a 32 bits thing. Well I don't want to tweak PHP, recompile or something, so for the time being, I will check the file size, and if it's over 2GB, I'm not sending the header.
thank you all for your input
来源:https://stackoverflow.com/questions/6748471/content-length-header-from-php-is-overwritten