@Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        channelActivated = true;
        // deactivate() may be called before channelActive() event if the first request contains
        // "connection:close" or triggers initiateConnectionShutdown().
        if (isAcquirable == null) {
            isAcquirable = true;
        }
        tryCompleteSessionPromise(ctx);
    }
{@code true} if an {@link Http2Settings} has been received from the remote endpoint.
core/src/main/java/com/linecorp/armeria/client/HttpSessionHandler.java