Spring Boot Cors问题:尝试了所有方法，但POST不起作用

@CrossOrigin(origins = "http://example.com", methods = RequestMethod.POST)
@RestController
public class MyController {
    // ...
}

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("http://example.com")
                .allowedMethods("POST")
                .allowedHeaders("*");
    }
}

@Component
public class CorsFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setHeader("Access-Control-Allow-Origin", "http://example.com");
        httpResponse.setHeader("Access-Control-Allow-Methods", "POST");
        httpResponse.setHeader("Access-Control-Allow-Headers", "*");
        chain.doFilter(request, response);
    }
}