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在用spring cloud zuul做Filter的时候，访问微服务出现跨域问题，在网上找了很多办法：

zuul:  ignored-headers: Access-Control-Allow-Credentials, Access-Control-Allow-Origin

参照：

方法1

@Componentpublic class CloudFilter extends ZuulFilter {
       @Override    public String filterType() {        return "pre";    }    @Override    public int filterOrder() {        return 0;    }    @Override    public boolean shouldFilter() {        return true;    }    @Override    public Object run() {        RequestContext ctx = RequestContext.getCurrentContext();            HttpServletResponse response = ctx.getResponse();            response.addHeader("Access-Control-Allow-Origin", "*");            response.setContentType("application/json");            response.setCharacterEncoding("UTF-8");            response.setContentType("text/html;charset=UTF-8");}}

方法2

@Bean    public CorsFilter corsFilter() {        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();        final CorsConfiguration config = new CorsConfiguration();        config.setAllowCredentials(true);        config.addAllowedOrigin("*");        config.addAllowedHeader("*");        config.addAllowedMethod("OPTIONS");        config.addAllowedMethod("HEAD");        config.addAllowedMethod("GET");        config.addAllowedMethod("PUT");        config.addAllowedMethod("POST");        config.addAllowedMethod("DELETE");        config.addAllowedMethod("PATCH");        source.registerCorsConfiguration("/**", config);        return new CorsFilter(source);    }

参照：

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