Haproxy has a header deletion function which is buggy and might lead to errors when you loadbalance. Read $URL for details, I think it's a *really* mean bug, we should punt <=1.4.11-r1 from portage
Created attachment 262323 [details] haproxy-1.4.11-r1.ebuild
Created attachment 262325 [details, diff] haproxy-1.4.11-fix-header-removal.diff
Created attachment 262331 [details] haproxy-1.4.11-r1.ebuild EAPI="2" was missing.
Commit: http://git.1wt.eu/web?p=haproxy-1.4.git;a=commit;h=8e63af6d919f246f119e22a6c5e4ac51d6eb23cc
Fixed in CVS, thanks.