fix the previous commit

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 42e3007..680d77a 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -323,7 +323,7 @@
     { ngx_string("proxy_cache"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
       ngx_http_proxy_cache,
-      0,
+      NGX_HTTP_LOC_CONF_OFFSET,
       0,
       NULL },