fixed 1774:CAS client broken when using routes.py, thanks remco.boerma

VERSION

@@ -1 +1 @@
-Version 2.7.4-stable+timestamp.2013.11.16.03.15.58
+Version 2.7.4-stable+timestamp.2013.11.16.03.22.18

gluon/contrib/login_methods/cas_auth.py

@@ -9,7 +9,7 @@ License: GPL v2
 Tinkered by Szabolcs Gyuris < szimszo n @ o regpreshaz dot eu>
 """
 
-from gluon import current, redirect
+from gluon import current, redirect, URL
 
 
 class CasAuth(object):
@@ -56,15 +56,9 @@ class CasAuth(object):
         self.maps = maps
         self.casversion = casversion
         self.casusername = casusername
-        http_host = current.request.env.http_x_forwarded_host
-        if not http_host:
-            http_host = current.request.env.http_host
-        if current.request.env.wsgi_url_scheme in ['https', 'HTTPS']:
-            scheme = 'https'
-        else:
-            scheme = 'http'
-        self.cas_my_url = '%s://%s%s' % (
-            scheme, http_host, current.request.env.path_info)
+        self.cas_my_url = URL(args=current.request.args,
+                              vars=current.request.vars,
+                              scheme=True)
 
     def login_url(self, next="/"):
         current.session.token = self._CAS_login()