NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL  428 src/http/ngx_http_upstream.c     { ngx_string("Cache-Control"), NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL },
NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL 4206 src/http/ngx_http_upstream.c     if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL) {