Origin y Referer

Algunos navegadores no envían Origin, la forma de obtenerlo es mirar en
el Referer.

app/controllers/api/v1/base_controller.rb

@@ -23,8 +23,30 @@ module Api
                      end
       end
 
+      # Referer
+      #
+      # @see {https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referer}
+      # @return [String,Nil]
+      def referer
+        request.referer
+      end
+      alias referrer referer
+
+      # Origin
+      #
+      # @see {https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Origin}
+      # @return [String,Nil]
       def origin
-        request.headers['Origin']
+        request.origin
+      end
+
+      # Genera un header Origin a partir del Referer si existe.
+      #
+      # @return [String,Nil]
+      def origin_from_referer
+        return if referer.blank?
+
+        referer.split('/', 4).tap { |u| u.pop if u.size > 3 }.join('/')
       end
 
       # Los navegadores antiguos no envían Origin