mod_proxy + SSL error 70023 with POSTs

[Scott Beardsley <scott@xxxxxxxxxxxxxxx>]

I'm attempting to place Apache (2.2.8) + mod_ssl(OpenSSL/0.9.8g) in 
front of a web application that uses AJAX POSTs extensively. For some 
reason all POSTs fail with the following message in apache's error.log 
(and 500 errors get sent back to the client):

[Fri Dec 12 11:02:07 2008] [error] (70023)This function has not been 
implemented on this platform: proxy: prefetch request body failed to 
10.6.0.1:8080 (10.6.0.1) from client.ip.add.ress ()
[Fri Dec 12 11:02:07 2008] [error] [client client.ip.add.ress] Handler 
for proxy-server returned invalid result code 70023, referer: 
https://example.com/

I've tried playing with many combinations of the following env vars:

      # use either proxy-sendcl or proxy-sendchunked not both
      SetEnv proxy-sendcl 1
#      SetEnv proxy-sendchunked 1
      SetEnv force-proxy-request-1.0 1
      SetEnv proxy-nokeepalive 1

I'm running on x86_64 (Intel) Gutsy 2.6.24-22-server. I searched around 
a bit but couldn't find any identical problems. Any ideas?

Also, I should note that I have a self-signed cert (with the CA loaded 
in my browser (firefox 3)). This problem does not occur when I disable SSL.

Scott

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