Angular:使用HttpClient.request()将数据上传到Springboot应用程序时，访问被CORS策略阻止

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("http://frontend-domain.com")
                .allowedMethods("GET", "POST", "PUT", "DELETE")
                .allowedHeaders("*")
                .allowCredentials(true);
    }
}

import { HttpClient, HttpHeaders } from '@angular/common/http';

const httpOptions = {
  headers: new HttpHeaders({
    'Content-Type': 'application/json',
    'Access-Control-Allow-Origin': 'http://frontend-domain.com',
    'Access-Control-Allow-Credentials': 'true'
  })
};

constructor(private http: HttpClient) { }

uploadData(data: any) {
  return this.http.post('http://backend-api.com/upload', data, httpOptions);
}

{
  "/api": {
    "target": "http://backend-api.com",
    "secure": false,
    "changeOrigin": true
  }
}