How can I add content-type to request header

I use addHeader(Rawcode) in my code but it always ignore it and show this 
error

Explicitly set HTTP header 'content-type: application/json' is ignored, 
illegal RawHeader


```

val responseFuture: Future[HttpResponse] =
  Http().singleRequest(HttpRequest(HttpMethods.PUT, uri = 
"http://localhost/log/";, entity = 
HttpEntity(RealData.fakeData).withContentType(ContentTypes.`application/json`)  
).withHeaders(RawHeader("x-auth-id",RealData.xAuthId),RawHeader("lang","fa"),RawHeader("content-type","application/json")))

```

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