nginx 0.4.13 *) Feature: the "proxy_pass" directive may be used inside the "limit_except" block. *) Feature: the "limit_except" directive supports all WebDAV methods. *) Bugfix: if the "add_before_body" directive was used without the "add_after_body" directive, then an response did not transferred complete. *) Bugfix: a large request body did not receive if the epoll method and the deferred accept() were used. *) Bugfix: a charset could not be set for ngx_http_autoindex_module responses; bug appeared in 0.3.50. *) Bugfix: the "[alert] zero size buf" error when FastCGI server was used; *) Bugfix: the --group= configuration parameter was ignored. Thanks to Thomas Moschny. *) Bugfix: the 50th subrequest in SSI response did not work; bug appeared in 0.3.50.

--- a/src/event/ngx_event_pipe.c
+++ b/src/event/ngx_event_pipe.c
@@ -511,6 +511,7 @@ ngx_event_pipe_write_to_downstream(ngx_e
                 cl = p->out;
 
                 if (cl->buf->recycled
+                    && cl->buf->last_shadow
                     && bsize + cl->buf->last - cl->buf->pos > p->busy_size)
                 {
                     flush = 1;
@@ -525,6 +526,7 @@ ngx_event_pipe_write_to_downstream(ngx_e
                 cl = p->in;
 
                 if (cl->buf->recycled
+                    && cl->buf->last_shadow
                     && bsize + cl->buf->last - cl->buf->pos > p->busy_size)
                 {
                     flush = 1;