Wikia/app — pull request #3833 by macbre (2014-06-05 10:08:58+00:00)
Title: AssetsManager: add X-Served-By and X-Backend-Response-Time response headers

@prein / @michalroszka / @Wikia/platform-team

```
X-Backend-Response-Time: 1.589
X-Served-By: dev-macbre, cache-wk-sv104-WKSJC, cache-ams4120-AMS
```