Reanimation of an undocumented feature of mod_proxy:

ProxyReceiveBufferSize

Submitted by: Ralf S. Engelschall
PR#: 1348


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80599 13f79535-47bb-0310-9956-ffa450edef68