use shared ngx_http_upstream_ignore_headers_masks[]
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index de591a7..ff11d46 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -157,15 +157,6 @@
 };
 
 
-static ngx_conf_bitmask_t  ngx_http_proxy_ignore_headers_masks[] = {
-    { ngx_string("X-Accel-Redirect"), NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT },
-    { ngx_string("X-Accel-Expires"), NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES },
-    { ngx_string("Expires"), NGX_HTTP_UPSTREAM_IGN_EXPIRES },
-    { ngx_string("Cache-Control"), NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL },
-    { ngx_null_string, 0 }
-};
-
-
 ngx_module_t  ngx_http_proxy_module;
 
 
@@ -432,7 +423,7 @@
       ngx_conf_set_bitmask_slot,
       NGX_HTTP_LOC_CONF_OFFSET,
       offsetof(ngx_http_proxy_loc_conf_t, upstream.ignore_headers),
-      &ngx_http_proxy_ignore_headers_masks },
+      &ngx_http_upstream_ignore_headers_masks },
 
 #if (NGX_HTTP_SSL)