Ensure multiple leading / are also removed, thanks @homakov

lib/devise/controllers/store_location.rb

@@ -33,7 +33,7 @@ module Devise
       #
       def store_location_for(resource_or_scope, location)
         session_key = stored_location_key_for(resource_or_scope)
-        session[session_key] = URI.parse(location).path if location
+        session[session_key] = URI.parse(location).path.sub(/\A\/+/, '/') if location
       end
 
       private

test/controllers/helpers_test.rb

@@ -199,9 +199,10 @@ class ControllerAuthenticatableTest < ActionController::TestCase
   end
 
   test 'store location for stores only paths' do
-    assert_nil @controller.stored_location_for(:user)
     @controller.store_location_for(:user, "//host/foo.bar")
     assert_equal "/foo.bar", @controller.stored_location_for(:user)
+    @controller.store_location_for(:user, "///foo.bar")
+    assert_equal "/foo.bar", @controller.stored_location_for(:user)
   end
 
   test 'after sign in path defaults to root path if none by was specified for the given scope' do