Better handling of late upstream creation. Configuration with duplicate upstream blocks defined after first use, i.e. like server { ... location / { proxy_pass http://backend; } } upstream backend { ... } upstream backend { ... } now correctly results in "duplicate upstream" error. Additionally, upstream blocks defined after first use now handle various server directive parameters ("weight", "max_fails", etc.). Previously configuration like server { ... location / { proxy_pass http://backend; } } upstream backend { server 127.0.0.1 max_fails=5; } incorrectly resulted in "invalid parameter "max_fails=5"" error.

--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4335,6 +4335,10 @@ ngx_http_upstream_add(ngx_conf_t *cf, ng
             continue;
         }
 
+        if (flags & NGX_HTTP_UPSTREAM_CREATE) {
+            uscfp[i]->flags = flags;
+        }
+
         return uscfp[i];
     }