nginx 0.3.29 *) Feature: now nginx uses less memory, if PHP in FastCGI mode sends many warnings before the response. *) Bugfix: the "Transfer-Encoding: chunked" header line was issued in the 204 responses for the HTTP/1.1 requests. *) Bugfix: nginx returned the 502 response, if the complete response header lines were transferred in a separate FastCGI records. *) Bugfix: if the proxied URI was specified in the "post_action" directive, then it ran only after a successful completion of a request.

--- a/src/http/modules/ngx_http_chunked_filter_module.c
+++ b/src/http/modules/ngx_http_chunked_filter_module.c
@@ -50,7 +50,10 @@ static ngx_http_output_body_filter_pt   
 static ngx_int_t
 ngx_http_chunked_header_filter(ngx_http_request_t *r)
 {
-    if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED || r != r->main) {
+    if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
+        || r->headers_out.status == NGX_HTTP_NO_CONTENT
+        || r != r->main)
+    {
         return ngx_http_next_header_filter(r);
     }