WSRequest request = ws.url("http://abababa .com");
WSRequest complexRequest = request.setHeader("X-API-Key", "xxxxxx")
            .setHeader("Content-Type", "application/x-www-form-urlencoded")
CompletionStage<WSResponse> responsePromise = complexRequest.post("grant_type=password"
            + "&username=xxxxx&password=yyyyy");
CompletionStage<JsonNode> jsonPromise = responsePromise.thenApply(WSResponse::asJson);