Zuul代理CORS标头包含多个值，标头重复两次-Java Spring Boot CORS过滤器配置

为什么我要让每个CORS标头都加倍？我正在使用Zuul代理，以通过API网关代理对服务的请求。

我的Spring安全性过滤顺序必须配置不正确。

当我访问需要身份验证的路由时，出现如下错误：

通过API网关请求服务错误

XMLHttpRequest cannot load https://myservice.mydomain.com:8095/service/v1/account/txHistory?acctId=0.  
The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed. 
Origin 'http://localhost:9000' is therefore not allowed access.

Chrome网络日志

我检查了Chrome devtools中的响应，并确保足够重复CORS标头两次：

因此，这看起来好像我的CORS过滤器针对每个回复都被调用了两次。我不知道为什么现在会发生这种情况。可能是在ChannelProcessingFilter之前添加了我的过滤器。

API网关CORS过滤器的代码：

public class SimpleCORSFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {}

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse res = (HttpServletResponse) response;
        res.setHeader("Access-Control-Allow-Origin", "*");
        res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT");
        res.setHeader("Access-Control-Max-Age", "3600");
        res.setHeader("Access-Control-Allow-Headers", "Authorization, Content-Type, Accept, x-requested-with, Cache-Control");
        chain.doFilter(request, res);
    }

    @Override
    public void destroy() {}
}

我的API网关安全性配置：

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    @Inject
    public void setUserDetailsService(UserDetailsService userDetailsService) {
        this.userDetailsService = userDetailsService;
    }

    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder authenticationManagerBuilder) throws Exception {
        authenticationManagerBuilder.userDetailsService(userDetailsService)
                .passwordEncoder(new BCryptPasswordEncoder());
    }

    @Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        httpSecurity
            .sessionManagement()
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
           .authorizeRequests()
                .antMatchers(HttpMethod.OPTIONS, "/**").permitAll()
                .antMatchers("/health","/metrics", "/v1/users/register").permitAll()
                .antMatchers("/mappings", "/v1/**", "/service/**").authenticated()
                .and()
            .httpBasic()
                .realmName("apiRealm")
                .and()
            .csrf()
                .disable()
            .headers()
                .frameOptions().disable()
            .and().addFilterBefore(new SimpleCORSFilter(), ChannelProcessingFilter.class);
    }

}

我可以通过检查标头是否为空来解决此问题，然后仅在标头为空或null时进行设置，尽管这似乎不是最佳解决方案。我想了解我所做的使标头被预置两次的操作。