/**
         * Sets priority of the stream which should be one of the
         * {@link #STREAM_PRIORITY_IDLE STREAM_PRIORITY_*} values.
         * The stream is given {@link #STREAM_PRIORITY_MEDIUM} priority if
         * this method is not called.
         *
         * @param priority priority of the stream which should be one of the
         *         {@link #STREAM_PRIORITY_IDLE STREAM_PRIORITY_*} values.
         * @return the builder to facilitate chaining.
         */
        public abstract Builder setPriority(int priority);

        /**
         * Delays sending request headers until {@link BidirectionalStream#flush()}
         * is called. This flag is currently only respected when QUIC is negotiated.
         * When true, QUIC will send request header frame along with data frame(s)
         * as a single packet when possible.
         *
         * @param delayRequestHeadersUntilFirstFlush if true, sending request headers will
         *         be delayed until flush() is called.
         * @return the builder to facilitate chaining.
         */
        public abstract Builder delayRequestHeadersUntilFirstFlush(
                boolean delayRequestHeadersUntilFirstFlush);