CORS Configuration.java

@Configuration
class CorsConfiguration {
    @Bean
    WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(final CorsRegistry registry) {
                registry.addMapping("/**")
                        .allowedHeaders("*")
                        .allowedMethods("*")
                        .allowedOriginPatterns(
                                "http://localhost:3000",
                                "https://*.myservice.com",
                                "http://*.myservice.io");
            }
        };
    }
}