diff --git a/colab/proxy/gitlab/views.py b/colab/proxy/gitlab/views.py
index c09c19c..14f0d6c 100644
--- a/colab/proxy/gitlab/views.py
+++ b/colab/proxy/gitlab/views.py
@@ -5,5 +5,5 @@ from ..utils.views import ColabProxyView
 
 
 class GitlabProxyView(ColabProxyView):
-    upstream = settings.PROXIED_APPS['gitlab']['upstream']
+    app_label = 'gitlab'
     diazo_theme_template = 'proxy/gitlab.html'
diff --git a/colab/proxy/jenkins/views.py b/colab/proxy/jenkins/views.py
index 079fc8b..e7ab64e 100644
--- a/colab/proxy/jenkins/views.py
+++ b/colab/proxy/jenkins/views.py
@@ -5,4 +5,4 @@ from ..utils.views import ColabProxyView
 
 
 class JenkinsProxyView(ColabProxyView):
-    upstream = settings.PROXIED_APPS['jenkins']['upstream']
+    app_label = 'jenkins'
diff --git a/colab/proxy/redmine/views.py b/colab/proxy/redmine/views.py
index 5899440..34f6f06 100644
--- a/colab/proxy/redmine/views.py
+++ b/colab/proxy/redmine/views.py
@@ -5,5 +5,5 @@ from ..utils.views import ColabProxyView
 
 
 class RedmineProxyView(ColabProxyView):
-    upstream = settings.PROXIED_APPS['redmine']['upstream']
+    app_label = 'redmine'
     diazo_theme_template = 'proxy/redmine.html'
diff --git a/colab/proxy/trac/views.py b/colab/proxy/trac/views.py
index 5ccdc85..d7291e4 100644
--- a/colab/proxy/trac/views.py
+++ b/colab/proxy/trac/views.py
@@ -8,7 +8,7 @@ from .models import Wiki, Ticket, Revision
 
 
 class TracProxyView(HitCounterViewMixin, ColabProxyView):
-    upstream = settings.PROXIED_APPS['trac']['upstream']
+    app_label = 'trac'
     diazo_theme_template = 'proxy/trac.html'
 
     def get_object(self):
diff --git a/colab/proxy/utils/views.py b/colab/proxy/utils/views.py
index 429ebe6..8393046 100644
--- a/colab/proxy/utils/views.py
+++ b/colab/proxy/utils/views.py
@@ -8,3 +8,12 @@ class ColabProxyView(ProxyView):
     add_remote_user = settings.REVPROXY_ADD_REMOTE_USER
     diazo_theme_template = 'base.html'
     html5 = True
+
+    @property
+    def upstream(self):
+        proxy_config = settings.PROXIED_APPS.get(self.app_label, {})
+        return proxy_config.get('upstream')
+
+    @property
+    def app_label(self):
+        raise NotImplementedError('app_label attribute must be set')
--
libgit2 0.21.2