public Builder requestData(InputStream requestData) {
            this.requestData = requestData;
            return this;
        }
Set an inputstream to use for the request. If not set, the data from
the original HttpRequest is used.

@param requestData data to be consumed, e.g. POST data
@return this Builder instance
container-core/src/main/java/com/yahoo/container/jdisc/HttpRequest.java