NGX_HTTP_UPSTREAM_IGN_EXPIRES  427 src/http/ngx_http_upstream.c     { ngx_string("Expires"), NGX_HTTP_UPSTREAM_IGN_EXPIRES },
NGX_HTTP_UPSTREAM_IGN_EXPIRES 4283 src/http/ngx_http_upstream.c     if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_EXPIRES) {