@Bean("dispatcherHandler")
    public DispatcherHandler dispatcherHandler() {
        return new DispatcherHandler();
    }
init dispatch handler.

@return {@link DispatcherHandler}.
shenyu-spring-boot-starter/shenyu-spring-boot-starter-gateway/src/main/java/org/apache/shenyu/springboot/starter/gateway/ShenyuConfiguration.java