BUGFIX: in some proxy scenarios https was not propergated properly

config/initializers/50-force_https.rb

@@ -0,0 +1,17 @@
+# tiny middleware to force https if needed
+class Discourse::ForceHttpsMiddleware
+
+  def initialize(app, config={})
+    @app = app
+  end
+
+  def call(env)
+    env['rack.url_scheme'] = 'https' if SiteSetting.use_https
+    @app.call(env)
+  end
+
+end
+
+
+Rails.configuration.middleware.insert_before MessageBus::Rack::Middleware, Discourse::ForceHttpsMiddleware
+