From 7fa89c744afd1f05f4405d9a60b8c63a65ea56cc Mon Sep 17 00:00:00 2001
From: Maxim Dounin <mdounin@mdounin.ru>
Date: Fri, 28 Nov 2014 16:57:50 +0300
Subject: [PATCH] Fixed post_action to not trigger "header already sent" alert.

The alert was introduced in 03ff14058272 (1.5.4), and was triggered on each
post_action invocation.

There is no real need to call header filters in case of post_action,
so return NGX_OK from ngx_http_send_header() if r->post_action is set.
---
 src/http/ngx_http_core_module.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 3b36f4a19..d8ff53bfe 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1973,6 +1973,10 @@ ngx_http_send_response(ngx_http_request_t *r, ngx_uint_t status,
 ngx_int_t
 ngx_http_send_header(ngx_http_request_t *r)
 {
+    if (r->post_action) {
+        return NGX_OK;
+    }
+
     if (r->header_sent) {
         ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                       "header already sent");