@Configuration

public class CorsConfiguration {

    @Bean

    public WebMvcConfigurer corsConfigurer() {

        return new WebMvcConfigurer() {

            @Override

            public void addCorsMappings(CorsRegistry registry) {

                registry.addMapping("/**");

            }

        };

    }

}

@Configuration

public class CorsConfiguration {

    @Bean

    public WebMvcConfigurer corsConfigurer() {

        return new WebMvcConfigurer() {

            @Override

            public void addCorsMappings(CorsRegistry registry) {

                registry.addMapping("/**")

                        .allowedOrigins("*")

                        .allowCredentials(true)

                        .allowedMethods("GET", "POST", "PUT", "DELETE");

            }

        };

    }

}

//package org.springframework.web.cors.CorsConfiguration

/** Wildcard representing <em>all</em> origins, methods, or headers. */

    public static final String ALL = "*";

    private static final List<HttpMethod> DEFAULT_METHODS = Collections.unmodifiableList(

            Arrays.asList(HttpMethod.GET, HttpMethod.HEAD));

    private static final List<String> DEFAULT_PERMIT_METHODS = Collections.unmodifiableList(

            Arrays.asList(HttpMethod.GET.name(), HttpMethod.HEAD.name(), HttpMethod.POST.name()));

    private static final List<String> DEFAULT_PERMIT_ALL = Collections.unmodifiableList(

            Collections.singletonList(ALL));

public CorsConfiguration applyPermitDefaultValues() {

        if (this.allowedOrigins == null) {

            this.allowedOrigins = DEFAULT_PERMIT_ALL;

        }

        if (this.allowedMethods == null) {

            this.allowedMethods = DEFAULT_PERMIT_METHODS;

            this.resolvedMethods = DEFAULT_PERMIT_METHODS

                    .stream().map(HttpMethod::resolve).collect(Collectors.toList());

        }

        if (this.allowedHeaders == null) {

            this.allowedHeaders = DEFAULT_PERMIT_ALL;

        }

        if (this.maxAge == null) {

            this.maxAge = 1800L;

        }

        return this;

    }