static void retryWith(ChannelHandlerContext ctx, SessionProtocol protocol) {
        HttpSession.get(ctx.channel()).retryWith(protocol);
        ctx.close();
    }
A handler that closes an HTTP/2 connection when the server responds with an HTTP/1 response, so that
HTTP/1 is used instead of HTTP/2 on next connection attempt.
core/src/main/java/com/linecorp/armeria/client/HttpClientPipelineConfigurator.java