zero ngx_url_t

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index a52b621..fea5cb5 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3393,6 +3393,8 @@
 
     value = cf->args->elts;
 
+    ngx_memzero(&u, sizeof(ngx_url_t));
+
     u.host = value[1];
     u.port = 53;