http_filter():
when delivering body bytes, only deliver one block of data (however
much is returned by bucket read) instead of delivering the entire
body at once; this gets painful with a large body
make a note of an issue with the blocking state of the socket;
currently, the socket is non-blocking, but when reading body bytes
we should feel free to wait for body bytes until a timeout occurs;
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86628
13f79535-47bb-0310-9956-
ffa450edef68