设置headers 报错Request header field Content-Type is not allowed by Access-Control-Allow-Headers

我要自定义一些参数放在headers里面，试了好多方法都不行
比如：http://ask.dcloud.net.cn/question/8596这里的很多个方式
http://ask.dcloud.net.cn/article/13026的方式
后来比较明确的报错Request header field “我自定义的key” is not allowed by Access-Control-Allow-Headers in preflight response.
又去搜了一下找到https://www.cnblogs.com/caimuqing/p/6733405.html，结果发现是后端需要把要传到后端的headers里面的key加入到response

// TODO 支持跨域访问  
        response.setHeader("Access-Control-Allow-Origin", "*");  
        response.setHeader("Access-Control-Allow-Credentials", "true");  
        response.setHeader("Access-Control-Allow-Methods", "*");  
        response.setHeader("Access-Control-Allow-Headers", "Content-Type,Access-Token");//这里“Access-Token”是我要传到后台的内容key  
        response.setHeader("Access-Control-Expose-Headers", "*");  

        if (request.getMethod().equals("OPTIONS")) {  
            HttpUtil.setResponse(response, HttpStatus.OK.value(), null);  
            return;  
        }

共勉给想要自定义headers的同学