@Bean
public TomcatServletWebServerFactory servletContainer() {
    TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory() {
        @Override
        protected void postProcessContext(Context context) {
            SecurityConstraint constraint = new SecurityConstraint();
            constraint.setUserConstraint(
 
"CONFIDENTIAL");
            SecurityCollection collection = new SecurityCollection();
            collection.addPattern("/*");
            constraint.addCollection(collection);
            context.addConstraint(constraint);
        }
    };
    tomcat.addAdditionalTomcatConnectors(httpConnector());
    
 
return tomcat;
}

@Bean
public Connector httpConnector() {
    Connector connector = new Connector("org.apache.coyote.http11.Http11NioProtocol");
    connector.setScheme("http");
    //Connector監聽的http的端口號
    connector.setPort(httpPort);
    connector.setSecure(false);
    //監聽到http的端口號後轉向到的https的端口號
    connector.setRedirectPort(httpsPort);
    
 
return connector;
}

SpringBoot 2 HTTP轉HTTPS