UPGRADE FROM 2.1 to 2.2

The _internal route is not used any more. It should then be removed from both your routing and security configurations. A fragments key has been added to the framework configuration and must be specified when ESI or Hinclude are in use. No security configuration is required for this path as by default ESI access is only permitted for trusted hosts and Hinclude access uses an URL signing mechanism.
```
framework:
    # ...
    fragments: { path: /_proxy }
```

Functional Tests

The profiler has been disabled by default in the test environment. You can enable it again by modifying the config_test.yml configuration file or even better, you can just enable it for the very next request by calling $client->enableProfiler() when you need the profiler in a test (that speeds up functional tests quite a bit).