Hi, On 26/07/18 17:01, Sze Howe Koh wrote:
To clarify: Did the server respond to your GET with "Connection: keep-alive" instead of "Connection: close", when you downloaded a metadata file (*meta.7z)?I sent requests from 3 different programs with different user-agents (plus 1 request from a VM). All of them got "Connection: close" from the server.
It's clearly a server-side configuration problem.Personal guess: I've just issues a GET for the URL you pasted above, got this reply in Firefox:
HTTP/1.1 200 OK Date: Fri, 27 Jul 2018 22:12:14 GMT Server: Apache/2.2.15 (CentOS) X-Prefix: 91.160.0.0/12 X-AS: 12322 Last-Modified: Mon, 29 May 2017 20:00:54 GMT ETag: "2a011fd-7fb-550af2502e980" Accept-Ranges: bytes Content-Length: 2043 Connection: close Content-Type: text/plain; charset=UTF-8
The key part is the server string: Apache 2.2.15 on CentOS. Which means CentOS 6, which made me ring an alarm bell in my head.
Quick check, download
http://mirror.centos.org/centos/6/os/x86_64/Packages/httpd-2.2.15-69.el6.centos.x86_64.rpm
Extract the RPM, and there it is, in all of its glory, a KeepAlive Off by default in Apache's master configuration file:
$ grep -nr KeepAlive . ./etc/httpd/conf/httpd.conf:73:# KeepAlive: Whether or not to allow persistent connections (more than ./etc/httpd/conf/httpd.conf:76:KeepAlive Off
This is a CentOS 6 specific change, as Apache's 2.2.15 default httpd.conf _obviously_ ships with KeepAlive On:
httpd-2.2.15$ grep -nr KeepAlive docs/conf/extra/httpd-default.conf.in:16:KeepAlive On
Cargo cult sysadminning FTW! (Luckily, it seems to have been removed in CentOS 7).
Interestingly, all 3 requests from Windows got a RST from the server, but the request from my Linux VM didn't. (All of them got "Connection: close", however). Is this a clue, or a red herring?
Red herring. -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Senior Software Engineer KDAB (France) S.A.S., a KDAB Group company Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com KDAB - The Qt, C++ and OpenGL Experts
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