2.4.x patch: http://people.apache.org/~minfrin/httpd-mod_cache-nocacheheader2.4.patch
+1: minfrin
+ * mod_cache: When serving from cache, only the last header of a multivalued
+ header was taken into account. Fixed.
+ trunk patch: http://svn.apache.org/r1478441
+ 2.4.x patch: trunk patch works (minus CHANGES)
+ +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