[libapreq] unknown content-type: `(null)'

[ch...@sportsrocket.com]

I've recently started getting the following error message from
Apache::Request:

   [libapreq] unknown content-type: `(null)'

These are all POSTs. Looking at the libapreq code, it seems like only a
broken browser that doesn't send the content-type header with POST
requests would cause this, but the user agents are usually later versions
of IE or Netscape.

This only shows up once every few hundred thousand pages, which makes it
hard to track down. Any ideas?

Thanks,
Chris