The fix for <rdar://problem/4965133> has introduced a new class of HTTP tests - ones that are local files, but load resources via HTTP. This doesn't work if the HTTP port differs from the default 8000 one. From LayoutTests/http/tests/local/file/url-sent-as-referer.html: frameObj.contentWindow.document.write("<img src=\"http://127.0.0.1:8000/security/resources/showRefererImage.php\"/>"); I think that a possible fix would be to preprocess the tests in this directory to insert actual port numbers. Also, please note that this test could be text-only.