applied nginx-1.2.1-location_if_inherits_proxy.patch to the nginx core. see http://mailman.nginx.org/pipermail/nginx-devel/2012-June/002374.html for details.

patches/nginx-1.2.1-location_if_inherits_proxy.patch

@@ -0,0 +1,15 @@
+--- nginx-1.2.1/src/http/modules/ngx_http_proxy_module.c	2012-04-23 18:40:01.000000000 +0800
++++ nginx-1.2.1-patched/src/http/modules/ngx_http_proxy_module.c	2012-06-24 12:48:57.289834450 +0800
+@@ -3023,8 +3023,10 @@
+ 
+     if (conf->upstream.upstream || conf->proxy_lengths) {
+         clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
+-        if (clcf->handler == NULL && clcf->lmt_excpt) {
+-            clcf->handler = ngx_http_proxy_handler;
++        if (clcf->handler == NULL) {
++            if (clcf->lmt_excpt) {
++                clcf->handler = ngx_http_proxy_handler;
++            }
+             conf->location = prev->location;
+         }
+     }

util/mirror-tarballs

@@ -85,6 +85,9 @@ patch -p1 < $root/patches/nginx-$main_ver-poll_del_event_at_exit.patch
 
 #patch -p1 < $root/patches/nginx-$main_ver-gzip_ok_invalid_read_fix.patch || exit 1
 
+echo applying location_if_inherits_proxy.patch ...
+patch -p1 < $root/patches/nginx-$main_ver-location_if_inherits_proxy.patch
+
 rm -f *.patch || exit 1
 
 cd .. || exit 1