svn operating through proxy?

Hello!

I tried to checkout a working copy of svn through a proxy and get the
following error messages:

 jw_at_kh1a927d:~> svn co http://svn.collab.net/repos/svn/trunk -d svn

 /home/jw/svn/subversion/libsvn_ra_dav/util.c:333
 apr_error: #20014, src_err 0 : <Error string not specified yet>
   OPTIONS request failed on /repos/svn/trunk

 /home/jw/svn/subversion/libsvn_ra_dav/util.c:307
 apr_error: #20014, src_err 0 : <Error string not specified yet>
   The OPTIONS status was 500, but expected 200.

When looking at the wire with ethereal I can see this:

My host sends to the proxy:
  OPTIONS http://svn.collab.net/repos/svn/trunk HTTP/1.1
  User-Agent: neon/0.21.2 SVN/0.13.0 (dev build)
  Connection: TE
  TE: trailers
  Content-Length: 104
  Content-Type: text/xml
  Host: svn.collab.net

The proxy answers:
  HTTP/1.0 500 Server Error
  Proxy-agent: Netscape-Proxy/3.52
  Date: Wed, 25 Jun 2002 22:03:21 GMT
  Content-type: text/html
  Content-length: 302

What am I doing wrong? Anyone an idea? Proxy operation works fine with
netscape, ncftp and wget.

-- 
-- Josef Wolf -- jw@raven.inka.de --
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