How to Integrate Spring Security CORS Filter?

Spring Security CORS Filter Integration

Spring Security requires CORS configuration to handle cross-origin requests. To address this issue specifically, follow these steps:

1. Implement a WebMvcConfigurerAdapter:

   <code class="java">@Configuration
   public class WebConfig extends WebMvcConfigurerAdapter {
   
       @Override
       public void addCorsMappings(CorsRegistry registry) {
           registry.addMapping("/**")
                   .allowedMethods("HEAD", "GET", "PUT", "POST", "DELETE", "PATCH");
       }
   }</code>

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2. Configure CORS in HttpSecurity:

   <code class="java">@Configuration
   public class SecurityConfig extends WebSecurityConfigurerAdapter {
       @Override
       protected void configure(HttpSecurity http) throws Exception {
           http.cors().configurationSource(corsConfigurationSource());
       }
   
       @Bean
       public CorsConfigurationSource corsConfigurationSource() {
           final CorsConfiguration configuration = new CorsConfiguration();
           configuration.setAllowedOrigins(ImmutableList.of("*"));
           configuration.setAllowedMethods(ImmutableList.of("HEAD",
                               "GET", "POST", "PUT", "DELETE", "PATCH"));
           configuration.setAllowCredentials(true);
           configuration.setAllowedHeaders(ImmutableList.of("Authorization", "Cache-Control", "Content-Type"));
           final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
           source.registerCorsConfiguration("/**", configuration);
           return source;
       }
   }</code>

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Important Notes:

• Avoid using http.authorizeRequests().antMatchers(HttpMethod.OPTIONS, "/**").permitAll(); or web.ignoring().antMatchers(HttpMethod.OPTIONS);, as they are incorrect solutions.
• Refer to the official Spring Security documentation for more details: http://docs.spring.io/spring-security/site/docs/4.2.x/reference/html/cors.html

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