解决：The ‘Access-Control-Allow-Origin‘ header contains multiple values‘x, *‘, but only one is allowed.

素颜马尾好姑娘i 2022-02-01 11:07 183阅读 0赞

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跨域问题报错：

Access to XMLHttpRequest at 'http://xx.xx.xx.xx/getUser' from origin 
    'http://ergouzi.fun' has been blocked by CORS policy: 
    The 'Access-Control-Allow-Origin' header contains multiple values 
    'http://ergouzi.fun, *, http://ergouzi.fun', but only one is allowed.

1. 为了解决跨域问题，我在服务端代码中加了个过滤器：

package gentle.filter;
    
    import javax.servlet.*;
    import javax.servlet.annotation.WebFilter;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /**
     * 解决跨域设置
     * （可把此设置放在 nginx 中，但只能设置一处）
     *
     * @author silence
     * @date 2018/12/11 15:19
     */
    
    @WebFilter(filterName = "requestFilter", urlPatterns = {"/*"})
    public class RequestFilter implements Filter {
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    
            HttpServletResponse response = (HttpServletResponse) servletResponse;
            HttpServletRequest request = (HttpServletRequest) servletRequest;
    
            // 此处 setHeader、addHeader 方法都可用。但 addHeader时写多个会报错：“...,but only one is allowed”
            // response.setHeader("Access-Control-Allow-Origin", "*");
            response.addHeader("Access-Control-Allow-Origin", request.getHeader("origin"));
            // 解决预请求（发送2次请求），此问题也可在 nginx 中作相似设置解决。
            response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Cache-Control,Pragma,Content-Type,Token, Content-Type");
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            String method = request.getMethod();
            if (method.equalsIgnoreCase("OPTIONS")) {
                servletResponse.getOutputStream().write("Success".getBytes("utf-8"));
            } else {
                filterChain.doFilter(servletRequest, servletResponse);
            }
        }
    
        @Override
        public void destroy() {
    
        }
    
    }

2. 同时在 nginx 中也作了相关配置：

add_header 'Access-Control-Allow-Origin' '*';
    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE';
    add_header 'Access-Control-Allow-Headers' 'Content-Type';
    ...

3. 运行报错如题。

4. 解决：此错表示设置重复，只允许设置一种，去除多余设置，保留一种即可。选择第1点中方法，或者第2点中方法都可以。

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跨域相关知识点解说： [https://blog.csdn.net/jiangyu1013/article/details/84315748][https_blog.csdn.net_jiangyu1013_article_details_84315748]

PS 跨域问题解决也见文章 ：[解决跨域问题：No 'Access-Control-Allow-Origin' header is present on the requested resource.][No _Access-Control-Allow-Origin_ header is present on the requested resource.]

[Link 1]: https://www.captainai.net/jiangyu1013/
[https_blog.csdn.net_jiangyu1013_article_details_84315748]: https://blog.csdn.net/jiangyu1013/article/details/84315748
[No _Access-Control-Allow-Origin_ header is present on the requested resource.]: https://blog.csdn.net/jiangyu1013/article/details/84957502

解决：The ‘Access-Control-Allow-Origin‘ header contains multiple values‘x, *‘, but only one is allowed.

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