@Nullable
    public void handleBinary(WebSocketWriter out) {
        out.close(WebSocketCloseStatus.INVALID_MESSAGE_TYPE, "Binary frames are not supported");
    }
Called when a binary frame is received. Binary frames are not supported by the graphql-ws protocol.
graphql/src/main/java/com/linecorp/armeria/server/graphql/GraphqlWSSubProtocol.java