Core: ngx_conf_set_keyval_slot() now accepts NGX_CONF_UNSET_PTR.

With this change, it is now possible to use ngx_conf_merge_ptr_value()
to merge keyval arrays.  This change actually follows much earlier
changes in ngx_conf_merge_ptr_value() and ngx_conf_set_str_array_slot()
in 1452:cd586e963db0 (0.6.10) and 1701:40d004d95d88 (0.6.22).

To preserve compatibility with existing 3rd party modules, both NULL
and NGX_CONF_UNSET_PTR are accepted for now.

1 files changed, 5 insertions, 3 deletions

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index c5c9e8587..413aec988 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -3268,7 +3268,6 @@ ngx_http_proxy_create_loc_conf(ngx_conf_t *cf)
      *     conf->method = NULL;
      *     conf->location = NULL;
      *     conf->url = { 0, NULL };
-     *     conf->headers_source = NULL;
      *     conf->headers.lengths = NULL;
      *     conf->headers.values = NULL;
      *     conf->headers.hash = { NULL, 0 };
@@ -3346,6 +3345,8 @@ ngx_http_proxy_create_loc_conf(ngx_conf_t *cf)
     /* "proxy_cyclic_temp_file" is disabled */
     conf->upstream.cyclic_temp_file = 0;
 
+    conf->headers_source = NGX_CONF_UNSET_PTR;
+
     conf->redirect = NGX_CONF_UNSET;
     conf->upstream.change_buffering = 1;
 
@@ -3819,12 +3820,13 @@ ngx_http_proxy_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
         }
     }
 
-    if (conf->headers_source == NULL) {
+    ngx_conf_merge_ptr_value(conf->headers_source, prev->headers_source, NULL);
+
+    if (conf->headers_source == prev->headers_source) {
         conf->headers = prev->headers;
 #if (NGX_HTTP_CACHE)
         conf->headers_cache = prev->headers_cache;
 #endif
-        conf->headers_source = prev->headers_source;
     }
 
     rc = ngx_http_proxy_init_headers(cf, conf, &conf->headers,