patch-yadis-noprotocol

diff --git a/Auth/Yadis/Yadis.php b/Auth/Yadis/Yadis.php
index 9ea2db7..45bb0c4 100644
--- a/Auth/Yadis/Yadis.php
+++ b/Auth/Yadis/Yadis.php
@@ -358,6 +358,14 @@ class Auth_Yadis_Yadis {
             }
 
             if ($yadis_location) {
+
+		// X-XRDS-Location: www.google.com/accounts/o8/id?source=profiles&id=...
+		if (!preg_match ('{^[a-z]+:}i', $yadis_location) &&
+		    preg_match ('{^[-_\.a-z\d]+\.[a-z]+(/.*)?$}i', $yadis_location))
+		    $yadis_location =
+			(preg_match('{^https://}i', $uri) ? 'https://' : 'http://')
+			. $yadis_location;
+
                 $result->xrds_uri = $yadis_location;
 
                 $response = $fetcher->get($yadis_location);