NGX_HTTP_AUTH_BUF_SIZE  109 http/modules/ngx_http_auth_basic_module.c     u_char                           buf[NGX_HTTP_AUTH_BUF_SIZE];
NGX_HTTP_AUTH_BUF_SIZE  182 http/modules/ngx_http_auth_basic_module.c         n = ngx_read_file(&file, buf + left, NGX_HTTP_AUTH_BUF_SIZE - left,