Wikia/app — pull request #4649 by macbre (2014-09-03 10:54:03+00:00)
Title: Generate and pass request ID to internal HTTP requests	

https://wikia-inc.atlassian.net/browse/PLATFORM-362

* generate unique id for each MW request
* report it to Logstash as ``@context.request_id`` field
* pass it to internal HTTP requests via ``X-Request-Id`` request header

@Wikia/platform-team