cors.java

@Configuration
public class RestConfiguration {

    @Bean
    public CorsFilter corsFilter() {

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true); // you USUALLY want this
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.addAllowedMethod("GET");
        config.addAllowedMethod("PUT");
        source.registerCorsConfiguration("/**", config);
        return new CorsFilter(source);
    }
}