Don't remove trailing slash from PATH_INFO for mounted apps

Previously when app was mounted as following:

    class Foo
      def call(env)
        [200, {}, [env['PATH_INFO']]]
      end
    end

    RackMountRailsBug::Application.routes.draw do
      mount RackTest.new => "/foo"
    end

trailing slash was removed from PATH_INFO. For example requesting

    GET /foo/bar/

on routes defined above would result in a response containing "/foo/bar"
instead of "/foo/bar/".

This commit fixes the issue.

(closes #3215)

1 files changed, 7 insertions, 1 deletions

diff --git a/actionpack/lib/action_dispatch/journey/router.rb b/actionpack/lib/action_dispatch/journey/router.rb
index 419e665d12..da32f1bfe7 100644
--- a/actionpack/lib/action_dispatch/journey/router.rb
+++ b/actionpack/lib/action_dispatch/journey/router.rb
@@ -54,7 +54,7 @@ module ActionDispatch
       end
 
       def call(env)
-        env['PATH_INFO'] = Utils.normalize_path(env['PATH_INFO'])
+        env['PATH_INFO'] = normalize_path(env['PATH_INFO'])
 
         find_routes(env).each do |match, parameters, route|
           script_name, path_info, set_params = env.values_at('SCRIPT_NAME',
@@ -103,6 +103,12 @@ module ActionDispatch
 
       private
 
+        def normalize_path(path)
+          path = "/#{path}"
+          path.squeeze!('/')
+          path
+        end
+
         def partitioned_routes
           routes.partitioned_routes
         end