proxying SSL throws errors

We're using mod_proxy to proxy from our internal to our external webserver (both apache2)

When proxying https:// traffic, we occasionally get:

[Fri Jun 18 10:14:25 2010] [warn] proxy: bad HTTP/1.1 header returned by /typo3/db_list.php (GET)
[Fri Jun 18 10:14:27 2010] [warn] proxy: bad HTTP/1.1 header returned by /typo3/alt_intro.php (GET)
[Fri Jun 18 10:14:35 2010] [warn] proxy: bad HTTP/1.1 header returned by /typo3/backend.php (GET)
[Fri Jun 18 10:39:32 2010] [warn] proxy: bad HTTP/1.1 header returned by /charite/kontaktformular/adresse/einhaeupl (GET)
[Fri Jun 18 10:41:16 2010] [warn] proxy: bad HTTP/1.1 header returned by /en/charite/contactform/adresse/jetschmann-1/ (GET)
[Fri Jun 18 10:41:16 2010] [warn] proxy: bad HTTP/1.1 header returned by /en/charite/contactform/adresse/giebe-1/ (GET)
[Fri Jun 18 10:43:31 2010] [warn] proxy: bad HTTP/1.1 header returned by /typo3temp/javascript_93077bb238.js (GET)
[Fri Jun 18 10:43:31 2010] [warn] proxy: bad HTTP/1.1 header returned by /fileadmin/charite/scripts/functions.js (GET)

by setting

ProxyBadHeader Ignore

this can be made to work, which results in:

[Fri Jun 18 11:28:12 2010] [warn] proxy: Ignoring bogus HTTP header returned by /fileadmin/user_upload/portal/allgemein/atmobilder/kontakt-stecker-01.jpg (GET)
[Fri Jun 18 11:28:12 2010] [warn] proxy: Ignoring bogus HTTP header returned by /fileadmin/charite/css/logo.jpg (GET)
[Fri Jun 18 11:28:14 2010] [warn] proxy: Ignoring bogus HTTP header returned by /fileadmin/charite/css/logo.jpg (GET)
[Fri Jun 18 11:28:15 2010] [warn] proxy: Ignoring bogus HTTP header returned by /fileadmin/user_upload/portal/allgemein/atmobilder/kontakt-stecker-01.jpg (GET)
[Fri Jun 18 11:28:19 2010] [warn] proxy: Ignoring bogus HTTP header returned by /fileadmin/user_upload/portal/allgemein/atmobilder/kontakt-stecker-01.jpg (GET)

The machine we're proxying to is:

ii apache2 2.2.9-10+lenny7 Apache HTTP Server metapackage
ii apache2-mpm-worker 2.2.9-10+lenny7 Apache HTTP Server - high speed threaded mod
ii libapache2-mod-fcgid 1:2.2-1 an alternative module compat with mod_fastcg

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: libapache2-mod-proxy-html 3.0.1-1
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic-pae 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic-pae i686
Architecture: i386
Date: Fri Jun 18 11:26:56 2010
SourcePackage: mod-proxy-html