Upstream keepalive module.
diff --git a/auto/options b/auto/options
index f30917c..2019498 100644
--- a/auto/options
+++ b/auto/options
@@ -95,6 +95,7 @@
HTTP_MP4=NO
HTTP_GZIP_STATIC=NO
HTTP_UPSTREAM_IP_HASH=YES
+HTTP_UPSTREAM_KEEPALIVE=YES
# STUB
HTTP_STUB_STATUS=NO
@@ -231,6 +232,7 @@
--without-http_empty_gif_module) HTTP_EMPTY_GIF=NO ;;
--without-http_browser_module) HTTP_BROWSER=NO ;;
--without-http_upstream_ip_hash_module) HTTP_UPSTREAM_IP_HASH=NO ;;
+ --without-http_upstream_keepalive_module) HTTP_UPSTREAM_KEEPALIVE=NO ;;
--with-http_perl_module) HTTP_PERL=YES ;;
--with-perl_modules_path=*) NGX_PERL_MODULES="$value" ;;