When proxy enabled a slow frontend client to read from an

     expensive backend server, it would wait until it had delivered
     the response to the slow frontend client completely before
     closing the backend connection. The backend connection is now
     closed as soon as the last byte is read from it, freeing up
     resources that would have been tied up unnecessarily.

The proxy code read chunks from the backend server in a
     hardcoded amount of 8k. The existing ProxyReceiveBufferSize
     parameter has been overloaded to specify the size of this buffer.

PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@93526 13f79535-47bb-0310-9956-ffa450edef68