Fix for 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://mailman.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
index 0f08d987e5394eb59a81ccb4161da7185be28b6c..0d66a4b6b92b4581c3c60ce2d2879acda8ec419a 100644 (file)
--- 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_http_request_t *r, ngx_int_t error)
     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_request_t *r,
         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_request_t *r,
     }
 
     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);