--- nginx-1.21.4/src/http/modules/ngx_http_proxy_module.c	2017-07-16 14:02:51.000000000 +0800
+++ nginx-1.21.4-patched/src/http/modules/ngx_http_proxy_module.c	2017-07-16 14:02:51.000000000 +0800
@@ -793,13 +793,13 @@ static ngx_keyval_t  ngx_http_proxy_cach
 static ngx_http_variable_t  ngx_http_proxy_vars[] = {
 
     { ngx_string("proxy_host"), NULL, ngx_http_proxy_host_variable, 0,
-      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },
+      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 },
 
     { ngx_string("proxy_port"), NULL, ngx_http_proxy_port_variable, 0,
-      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },
+      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 },
 
     { ngx_string("proxy_add_x_forwarded_for"), NULL,
-      ngx_http_proxy_add_x_forwarded_for_variable, 0, NGX_HTTP_VAR_NOHASH, 0 },
+      ngx_http_proxy_add_x_forwarded_for_variable, 0, 0, 0 },
 
 #if 0
     { ngx_string("proxy_add_via"), NULL, NULL, 0, NGX_HTTP_VAR_NOHASH, 0 },
