CORS problem with Okta, Angular and Spring

Hello.

I’m trying the example showed in: Securing Angular + Spring Boot App with Okta but i have the following error when i try to access the API rest from the Angular App:
"Access to XMLHttpRequest at 'http://localhost:8080/contacts' from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource."

Thanks in advance for any help.

You need a CORS filter in Spring Boot that allows requests from Angular. Try this tutorial: https://developer.okta.com/blog/2020/01/06/crud-angular-9-spring-boot-2

Hi.
Thanks, that solved the problem.
I change the next:

		 http.cors().configurationSource(request -> new CorsConfiguration(corsConfiguratione()));
	  http.antMatcher("/**")  
         .authorizeRequests()  
         .antMatchers(HttpMethod.OPTIONS, "/**").permitAll()
         .antMatchers("/").permitAll()  
         .anyRequest().authenticated();
	http.oauth2ResourceServer();

By:

                  http.antMatcher("/**")
				 .authorizeRequests()
				 .antMatchers(HttpMethod.OPTIONS, "/**").permitAll()
				 .antMatchers("/").permitAll()
				 .anyRequest().authenticated();
		 http.oauth2ResourceServer().jwt();

and i have added the next bean in the main class:

@Bean
	public FilterRegistrationBean<CorsFilter> simpleCorsFilter() {
		UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
		CorsConfiguration config = new CorsConfiguration();
		config.setAllowCredentials(true);
		config.setAllowedOrigins(Collections.singletonList("http://localhost:4200"));
		config.setAllowedMethods(Collections.singletonList("*"));
		config.setAllowedHeaders(Collections.singletonList("*"));
		source.registerCorsConfiguration("/**", config);
		FilterRegistrationBean<CorsFilter> bean = new FilterRegistrationBean<>(new CorsFilter(source));
		bean.setOrder(Ordered.HIGHEST_PRECEDENCE);
		return bean;
	}