Index: main/manager.c
===================================================================
--- main/manager.c	(revision 310239)
+++ main/manager.c	(working copy)
@@ -5839,7 +5839,7 @@
 		goto auth_callback_out;
 	}
 
-	ast_str_append(&http_header, 0, "Content-type: text/%s", contenttype[format]);
+	ast_str_append(&http_header, 0, "Content-type: text/%s\r\n", contenttype[format]);
 
 	if (format == FORMAT_XML) {
 		ast_str_append(&out, 0, "<ajax-response>\n");