2.4.x patch: http://people.apache.org/~minfrin/httpd-event-ThreadStackSize-error.patch
+1: minfrin
+ * mod_cache: Invalidate cached entities in response to RFC2616 Section
+ 13.10 Invalidation After Updates or Deletions. PR 15868
+ trunk patch: http://svn.apache.org/r1070179
+ http://svn.apache.org/r1478140
+ http://svn.apache.org/r1478173
+ 2.4.x patch: http://people.apache.org/~minfrin/httpd-mod_cache-invalidate.patch
+ +1: minfrin
+
A list of further possible backports can be found at:
http://people.apache.org/~rjung/patches/possible-backports-httpd-trunk-2_4.txt