Some routes seem to skip wsgi layer

This specifically happens with Flask-Restful.

```
app = Flask(__name__)
app.wsgi_app = MashapeAnalytics(app.wsgi_app, 'SERVICE_TOKEN', 'production')
api = Api(app)
```

Start by reproducing the Flask-Restful setup shown in the issue, focusing on the app.wsgi_app wrapper and the routes exposed through Api(app). Trace which routes do not pass through that wrapper. Done means the affected Flask-Restful routes consistently traverse the WSGI layer.

索引モデルが issue の本文から書いたものです。