Backport the fix to an edge case, it's now possible for a primary
  request which has a body in spite of what was determined by the
  header parsing; this would usually be due to an input filter between
  the client request and mod_proxy.  Add another consideration, and
  force the C-L determination if we saw bytes in already.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/proxy-reqbody-2.0.x@230726 13f79535-47bb-0310-9956-ffa450edef68