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The 'Access-Control-Allow-Origin' header contains multiple values'*, *', but only one is allowed.

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。

箴言:因为这些东西是非常简单的。不要抱怨自己学不会,那是因为你没有足够用心。



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“Access-Control-Allow-Origin“跨域问题

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