Fixed "expires @00h".

src/http/modules/ngx_http_headers_filter_module.c

diff --git a/src/http/modules/ngx_http_headers_filter_module.c b/src/http/modules/ngx_http_headers_filter_module.c
index c3f74ae..8524450 100644
--- a/src/http/modules/ngx_http_headers_filter_module.c
+++ b/src/http/modules/ngx_http_headers_filter_module.c
@@ -253,7 +253,7 @@
         return NGX_ERROR;
     }
 
-    if (conf->expires_time == 0) {
+    if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) {
         ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
                    ngx_cached_http_time.len + 1);
         ngx_str_set(&cc->value, "max-age=0");