正确配置 Spring Boot Security 跨域请求（C

如果 Spring Boot 项目引入 Spring Security 组件，单独声明 CorsConfigurationSource Bean 并不起作用，这是由于 CORS 预检请求不含 Session ID 而请求首先被 Spring Security 处理并拒绝导致的。

因此，必须明确地配置 Spring Security 跨域参数以便正常处理跨域请求，下面是一个配置示例：

@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            // cors 默认读取名为 corsConfigurationSource Bean 的配置
            .cors().and()
            ...
            //其它配置
    }

    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("https://example.com"));
        configuration.setAllowedMethods(Arrays.asList("GET","POST"));
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}