trunk patch: http://svn.apache.org/r1520368
2.4.x patch: trunk patch works
+1: trawick
+
+ * mod_headers: Add 'Header SetIfEmpty header-name val' to only set
+ a header if it's not already there (can't do this with Edit)
+ trunk patch: http://svn.apache.org/1496338
+ 2.4.x patch: trunk works
+ +1: covener
+
+ * mod_headers: Add 'Header note header-name note-name' to copy a headers
+ value into a note (so a CGI/Proxy header can be deleted and logged)
+ trunk patch: http://svn.apache.org/r1520908
+ 2.4.x patch: trunk works, if 1496338 above is merged first.
+ +1: covener
A list of further possible backports can be found at:
http://people.apache.org/~rjung/patches/possible-backports-httpd-trunk-2_4.txt