--- /dev/null
+--TEST--
+Bug #66891 (Unexpected HTTP 401 after NTLM authentication)
+--SKIPIF--
+<?php
+include "skipif.inc";
+?>
+--GET--
+dummy=1
+--FILE--
+<?php
+header("WWW-Authenticate: none");
+$r = new http\Env\Response;
+$r->setResponseCode(200);
+$r->send();
+var_dump(http_response_code());
+?>
+--EXPECT--
+int(200)
\ No newline at end of file