How to add an additional connector in spring boot's application?

SpringApplication.java

import org.apache.catalina.connector.Connector;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class SpringApplication {

    public static void main(String[] args) {
        new SpringApplicationBuilder(SpringApplication.class).run();
    }

    @Bean
    public ServletWebServerFactory servletContainer() {
        TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
        Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
        connector.setPort(8081);
        tomcat.addAdditionalTomcatConnectors(connector);
        return tomcat;
    }
}

Ref: https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-web-servers.html#howto-configure-ssl