# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1330949702 0
# Node ID e66122a62bde0f44a0258e7b51ef17019fce203c
# Parent  14f8e8a0cc77f232e63ece5ce28eff4ba24543ae
Merge of r4461: 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
@@ -1561,7 +1561,7 @@ 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");