如何在springboot中设定keepalive timeout

查看springboot的官方文档：https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.html#application-properties.server.server.tomcat.keep-alive-timeout

可以看到对server.tomcat.keep-alive-timeout这个参数的定义如下：
Time to wait for another HTTP request before the connection is closed. When not set the connectionTimeout is used. When set to -1 there will be no timeout.

可是在配置文件中按照上面所说，进行了定义：（注意，单位是毫秒，spring的文档历来是垃圾中的战斗机）

server:
  tomcat:
    keep-alive-timeout: 30000

运行后，发现不起任何作用。

于是只能按照上面所说的，对connection-timeout进行设置：

server:
  tomcat:
    connection-timeout: 30000

这样就起效了，说明keep-alive-timeout没有用，文档有误。

上述是通过配置来更改，还可以通过代码来设定keepalive_timeout，如下：

@Configuration
public class Config {

    @Bean   
    public ServletWebServerFactory servletContainer() {
        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
        tomcat
        .addConnectorCustomizers(new TomcatConnectorCustomizer() {
            @Override
            public void customize(Connector connector) {
                ((AbstractProtocol) connector.getProtocolHandler())
                        .setKeepAliveTimeout(30000);
            }
        });
        return tomcat;
    }

}