如何在Reactor Netty HTTP client中设置TCP Keepalive？

在Reactor Netty HTTP client中设置TCP Keepalive可以通过以下步骤实现：

创建一个HttpClient对象：

HttpClient httpClient = HttpClient.create();

使用TcpClient配置TCP Keepalive参数：

TcpClient tcpClient = TcpClient.create()
        .option(ChannelOption.SO_KEEPALIVE, true)
        .option(ChannelOption.TCP_KEEPIDLE, 60)
        .option(ChannelOption.TCP_KEEPINTVL, 60)
        .option(ChannelOption.TCP_KEEPCNT, 3);

其中，SO_KEEPALIVE设置为true表示启用TCP Keepalive，TCP_KEEPIDLE表示TCP连接空闲多长时间后开始发送Keepalive探测包，TCP_KEEPINTVL表示发送Keepalive探测包的间隔时间，TCP_KEEPCNT表示发送Keepalive探测包的次数。

将TcpClient配置应用到HttpClient对象中：

httpClient.tcpConfiguration(tcpClient);

完整的代码示例：

HttpClient httpClient = HttpClient.create()
        .tcpConfiguration(tcpClient -> tcpClient
                .option(ChannelOption.SO_KEEPALIVE, true)
                .option(ChannelOption.TCP_KEEPIDLE, 60)
                .option(ChannelOption.TCP_KEEPINTVL, 60)
                .option(ChannelOption.TCP_KEEPCNT, 3));

TCP Keepalive可以在以下场景中使用：