NGX_HTTP_CACHE_STALE  625 src/http/ngx_http_file_cache.c             rc = NGX_HTTP_CACHE_STALE;
NGX_HTTP_CACHE_STALE  827 src/http/ngx_http_upstream.c             rc = NGX_HTTP_CACHE_STALE;
NGX_HTTP_CACHE_STALE  848 src/http/ngx_http_upstream.c     case NGX_HTTP_CACHE_STALE:
NGX_HTTP_CACHE_STALE 2232 src/http/ngx_http_upstream.c                 u->cache_status = NGX_HTTP_CACHE_STALE;
NGX_HTTP_CACHE_STALE 3871 src/http/ngx_http_upstream.c                     u->cache_status = NGX_HTTP_CACHE_STALE;