# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1328884264 0
# Node ID 6299d1c4dbb4e3864ca8150e7d2816e0d4399ebe
# Parent  ccb2f8e3d08d412a994f6f17f3716733125b367a
Upstream: fixed "too big header" check.

If header filter postponed processing of a header by returning NGX_AGAIN
and not moved u->buffer->pos, previous check incorrectly assumed there
is additional space and did another recv() with zero-size buffer.  This
resulted in "upstream prematurely closed connection" error instead
of correct "upstream sent too big header" one.

Patch by Feibo Li.

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -1591,7 +1591,7 @@ ngx_http_upstream_process_header(ngx_htt
 
         if (rc == NGX_AGAIN) {
 
-            if (u->buffer.pos == u->buffer.end) {
+            if (u->buffer.last == u->buffer.end) {
                 ngx_log_error(NGX_LOG_ERR, c->log, 0,
                               "upstream sent too big header");