playframework/playframework — pull request #3141 by buster84 (2014-07-06 01:53:26+00:00)
Title: Fix duplicate Content-Type request header in WS

Hi,
WSClient adds Content-Type header even if user specify Content-Type already by using withHeaders.
This behavior is different from Play2.2.x. See [here](https://github.com/playframework/playframework/blob/2.2.x/framework/src/play/src/main/scala/play/api/libs/ws/WS.scala#L558).