The 'Access-Control-Allow-Origin' header contains multiple values'*, *', but onl

报错内容
The 'Access-Control-Allow-Origin' header contains multiple values '*, http://192.168.237.131', but only one is allowed. Have the server send the header with a valid value, or, if an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

出现这问题有可能是服务器端配置了跨域选项，在代码端也指定了跨域设置导致冲突，去掉一边的配置即可

代码中配置了跨域拦截器

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with");
        response.setHeader("Access-Control-Allow-Credentials","true");
        return super.preHandle(request, response, handler);
  }

nginx配置

add_header Access-Control-Allow-Origin *;
add_header Access-Control-Allow-Methods GET,POST,OPTIONS;    
add_header Access-Control-Allow-Headers X-Requested-With;

简单来说，就是跨域拦截配置冲突了，去掉其中之一即可。