--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -3408,6 +3408,113 @@ ngx_http_upstream_add(ngx_conf_t *cf, ng
 }
 
 
+ngx_int_t
+ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf,
+    ngx_http_upstream_conf_t *conf, ngx_http_upstream_conf_t *prev,
+    ngx_str_t *default_hide_headers, ngx_hash_init_t *hash)
+{
+    ngx_str_t       *h;
+    ngx_uint_t       i, j;
+    ngx_array_t      hide_headers;
+    ngx_hash_key_t  *hk;
+
+    if (conf->hide_headers == NGX_CONF_UNSET_PTR
+        && conf->pass_headers == NGX_CONF_UNSET_PTR)
+    {
+        conf->hide_headers_hash = prev->hide_headers_hash;
+
+        if (conf->hide_headers_hash.buckets) {
+            return NGX_OK;
+        }
+
+        conf->hide_headers = prev->hide_headers;
+        conf->pass_headers = prev->pass_headers;
+
+    } else {
+        if (conf->hide_headers == NGX_CONF_UNSET_PTR) {
+            conf->hide_headers = prev->hide_headers;
+        }
+
+        if (conf->pass_headers == NGX_CONF_UNSET_PTR) {
+            conf->pass_headers = prev->pass_headers;
+        }
+    }
+
+    if (ngx_array_init(&hide_headers, cf->temp_pool, 4, sizeof(ngx_hash_key_t))
+        != NGX_OK)
+    {
+        return NGX_ERROR;
+    }
+
+    for (h = default_hide_headers; h->len; h++) {
+        hk = ngx_array_push(&hide_headers);
+        if (hk == NULL) {
+            return NGX_ERROR;
+        }
+
+        hk->key = *h;
+        hk->key_hash = ngx_hash_key_lc(h->data, h->len);
+        hk->value = (void *) 1;
+    }
+
+    if (conf->hide_headers != NGX_CONF_UNSET_PTR) {
+
+        h = conf->hide_headers->elts;
+
+        for (i = 0; i < conf->hide_headers->nelts; i++) {
+
+            hk = hide_headers.elts;
+
+            for (j = 0; j < hide_headers.nelts; j++) {
+                if (ngx_strcasecmp(h[i].data, hk[j].key.data) == 0) {
+                    goto exist;
+                }
+            }
+
+            hk = ngx_array_push(&hide_headers);
+            if (hk == NULL) {
+                return NGX_ERROR;
+            }
+
+            hk->key = h[i];
+            hk->key_hash = ngx_hash_key_lc(h[i].data, h[i].len);
+            hk->value = (void *) 1;
+
+        exist:
+
+            continue;
+        }
+    }
+
+    if (conf->pass_headers != NGX_CONF_UNSET_PTR) {
+
+        h = conf->pass_headers->elts;
+        hk = hide_headers.elts;
+
+        for (i = 0; i < conf->pass_headers->nelts; i++) {
+            for (j = 0; j < hide_headers.nelts; j++) {
+
+                if (hk[j].key.data == NULL) {
+                    continue;
+                }
+
+                if (ngx_strcasecmp(h[i].data, hk[j].key.data) == 0) {
+                    hk[j].key.data = NULL;
+                    break;
+                }
+            }
+        }
+    }
+
+    hash->hash = &conf->hide_headers_hash;
+    hash->key = ngx_hash_key_lc; 
+    hash->pool = cf->pool;
+    hash->temp_pool = NULL;
+    
+    return ngx_hash_init(hash, hide_headers.elts, hide_headers.nelts);
+}
+
+
 static void *
 ngx_http_upstream_create_main_conf(ngx_conf_t *cf)
 {