[PATCH 07 of 31] Fix incorrect 201 replies from dav module

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1309178512 -14400
# Node ID 0ec754a289a69cea6b147a1744e277175658a772
# Parent  93729d259ec9d8d86d327f1084747af5e11575e8
Fix incorrect 201 replies from dav module.

Replies with 201 code contain body, and we should clearly indicate it's
empty if it's empty.  Before 0.8.32 chunked was explicitly disabled for
201 replies and as a result empty body was indicated by connection close
(not perfect, but worked).  Since 0.8.32 chunked is enabled, and this
causes incorrect responses from dav module when HTTP/1.1 is used: with
"Transfer-Encoding: chunked" but no chunks at all.

Fix is to actually return empty body in special response handler instead
of abusing r->header_only flag.

See here for initial report:

http://nginx.org/pipermail/nginx-ru/2010-October/037535.html

diff --git a/src/http/ngx_http_special_response.c b/src/http/ngx_http_special_response.c
--- a/src/http/ngx_http_special_response.c
+++ b/src/http/ngx_http_special_response.c
@@ -421,7 +421,6 @@ ngx_http_special_response_handler(ngx_ht
     if (error == NGX_HTTP_CREATED) {
         /* 201 */
         err = 0;
-        r->header_only = 1;
 
     } else if (error == NGX_HTTP_NO_CONTENT) {
         /* 204 */
@@ -636,7 +635,7 @@ ngx_http_send_special_response(ngx_http_
         r->headers_out.content_type_lowcase = NULL;
 
     } else {
-        r->headers_out.content_length_n = -1;
+        r->headers_out.content_length_n = 0;
     }
 
     if (r->headers_out.content_length) {
@@ -654,7 +653,7 @@ ngx_http_send_special_response(ngx_http_
     }
 
     if (ngx_http_error_pages[err].len == 0) {
-        return NGX_OK;
+        return ngx_http_send_special(r, NGX_HTTP_LAST);
     }
 
     b = ngx_calloc_buf(r->pool);