Limit conn: returned to the old behavior of using the first actual limit on
the way.

It was unintentionally changed in r4272, so that it could only limit the first
location where the processing of the request has reached PREACCESS phase.

src/http/modules/ngx_http_limit_conn_module.c

diff --git a/src/http/modules/ngx_http_limit_conn_module.c b/src/http/modules/ngx_http_limit_conn_module.c
index f98e7bc..6322fd6 100644
--- a/src/http/modules/ngx_http_limit_conn_module.c
+++ b/src/http/modules/ngx_http_limit_conn_module.c
@@ -159,8 +159,6 @@
         return NGX_DECLINED;
     }
 
-    r->main->limit_conn_set = 1;
-
     lccf = ngx_http_get_module_loc_conf(r, ngx_http_limit_conn_module);
     limits = lccf->limits.elts;
 
@@ -187,6 +185,8 @@
             continue;
         }
 
+        r->main->limit_conn_set = 1;
+
         hash = ngx_crc32_short(vv->data, len);
 
         shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr;