ngx_http_upstream_cache_etag   24 src/http/ngx_http_upstream.c static ngx_int_t ngx_http_upstream_cache_etag(ngx_http_request_t *r,
ngx_http_upstream_cache_etag  393 src/http/ngx_http_upstream.c       ngx_http_upstream_cache_etag, 0,