[Bug 589611] [NEW] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23)

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Binary package hint: apache2

This is going to be a tough one.
We're seeing sporadic "client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23)" errors in our log:

[Fri Jun 04 11:26:43 2010] [error] [client 85.181.79.82] client sent
HTTP/1.1 request without hostname (see RFC2616 section 14.23):
/squirrelmail/src/download.php

Looking at the past logs we find:

# zfgrep -c "client sent HTTP/1.1 request without hostname" /var/log/apache2/webmail/error.log*
/var/log/apache2/webmail/error.log:2133
/var/log/apache2/webmail/error.log.1:2619
/var/log/apache2/webmail/error.log.2.gz:2430
/var/log/apache2/webmail/error.log.3.gz:2851
/var/log/apache2/webmail/error.log.4.gz:2363
/var/log/apache2/webmail/error.log.5.gz:4
/var/log/apache2/webmail/error.log.6.gz:1
/var/log/apache2/webmail/error.log.7.gz:0
/var/log/apache2/webmail/error.log.8.gz:0

in /var/log/apache2/webmail/error.log.4.gz we're seeing as first errors:

[Sun May 02 15:28:52 2010] [error] [client 84.189.159.92] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /squirrelmail/images/up_pointer.png, referer: https://webmail.charite.de/squirrelmail/src/right_main.php?PG_SHOWALL=0&sort=0&startMessage=1&mailbox=INBOX
[Sun May 02 15:56:23 2010] [error] [client 85.178.232.99] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /squirrelmail/images/up_pointer.png, referer: https://webmail.charite.de/squirrelmail/src/right_main.php?PG_SHOWALL=0&sort=0&startMessage=1&mailbox=INBOX&composenew=0&composesession=0&session=0&use_mailbox_cache=0

on May the 2nd, we're seeing these updates/installs:

2010-05-03 11:59:20 install php-mail <keine> 1.1.14-2
2010-05-03 14:58:46 install apache2-threaded-dev <keine> 2.2.12-1ubuntu2.2
2010-05-03 15:17:26 install libc-client2007b <keine> 8:2007b~dfsg-1.1build1
2010-05-03 15:49:09 install linux-image-2.6.32-22-virtual <keine> 2.6.32-22.33
2010-05-03 15:49:14 install linux-headers-2.6.32-22 <keine> 2.6.32-22.33
2010-05-03 15:49:26 install linux-headers-2.6.32-22-generic-pae <keine> 2.6.32-22.33

The whole machine has been updated to lucid on April 30th. So it's
unclear if it's the libc update OR a regression from the lucid upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: apache2 2.2.14-5ubuntu8
ProcVersionSignature: Ubuntu 2.6.32-22.35-generic-pae 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic-pae i686
Architecture: i386
Date: Fri Jun  4 11:52:54 2010
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: apache2

** Affects: apache2 (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: apport-bug i386 lucid
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client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23)
https://bugs.launchpad.net/bugs/589611
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