http://svn.apache.org/viewvc?rev=1365029&view=rev
2.4.x patch: http://people.apache.org/~jorton/ap_proxyblock-24x-v2.diff [avoids major MMN bump]
+1: jorton, rjung
- rjung: Typo "Backwards-compatibile", minor MMN bump only in comment, but forgotten in define!
- jorton: fixed in -v2
A list of further possible backports can be found at:
http://people.apache.org/~rjung/patches/possible-backports-httpd-trunk-2_4.txt