Let "add_header" affect 201 responses (ticket #125).
diff --git a/src/http/modules/ngx_http_headers_filter_module.c b/src/http/modules/ngx_http_headers_filter_module.c
index 336f966..0dfe810 100644
--- a/src/http/modules/ngx_http_headers_filter_module.c
+++ b/src/http/modules/ngx_http_headers_filter_module.c
@@ -155,6 +155,7 @@
     if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
         || r != r->main
         || (r->headers_out.status != NGX_HTTP_OK
+            && r->headers_out.status != NGX_HTTP_CREATED
             && r->headers_out.status != NGX_HTTP_NO_CONTENT
             && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
             && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY