cl-http behind a apache reverse proxy

I want to run cl-http behind a apache proxy (reverse proxy)
   it works,  if I access  the export-urls with a :directory attribute.
   Trying  :html-computed-form the apache prints a error message:
  "Proxy Error
  The proxy server received an invalid response from an upstream server.
  The proxy server could not handle the request  GET /index.html   "
   (Index.html is a :html-computed-form)

It looks like the apache (as a client!) closes the stream to cl-http. 
Wrong protocoll ?  No content-length ? 

Some ideas, where I should look for?

Helmut

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