nginx 1.3.8 *) Feature: the "optional_no_ca" parameter of the "ssl_verify_client" directive. Thanks to Mike Kazantsev and Eric O'Connor. *) Feature: the $bytes_sent, $connection, and $connection_requests variables can now be used not only in the "log_format" directive. Thanks to Benjamin Grössing. *) Feature: the "auto" parameter of the "worker_processes" directive. *) Bugfix: "cache file ... has md5 collision" alert. *) Bugfix: in the ngx_http_gunzip_filter_module. *) Bugfix: in the "ssl_stapling" directive.

--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2287,6 +2287,7 @@ ngx_http_upstream_send_response(ngx_http
             return;
         }
 
+        p->buf_to_file->start = u->buffer.start;
         p->buf_to_file->pos = u->buffer.start;
         p->buf_to_file->last = u->buffer.pos;
         p->buf_to_file->temporary = 1;