From: Maxim Dounin <mdounin@mdounin.ru>
Date: Fri, 18 Oct 2013 14:13:44 +0000 (+0400)
Subject: Headers filter: empty Cache-Control is no longer added.
X-Git-Tag: release-1.5.7~16
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=6291a299925e2de2fc7c8793423d62b029ffab92;p=nginx.git

Headers filter: empty Cache-Control is no longer added.

Much like with other headers, "add_header Cache-Control $value;" no longer
results in anything added to response headers if $value evaluates to an
empty string.
---

diff --git a/src/http/modules/ngx_http_headers_filter_module.c b/src/http/modules/ngx_http_headers_filter_module.c
index 0dfe8101e..e33e7ce52 100644
--- a/src/http/modules/ngx_http_headers_filter_module.c
+++ b/src/http/modules/ngx_http_headers_filter_module.c
@@ -339,6 +339,10 @@ ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
 {
     ngx_table_elt_t  *cc, **ccp;
 
+    if (value->len == 0) {
+        return NGX_OK;
+    }
+
     ccp = r->headers_out.cache_control.elts;
 
     if (ccp == NULL) {