请教 Tomcat 配置 CORS 跨域问题

[Kei001]

按照网上方式给项目 web.xml 文件里添加如下 CorsFilter 过滤器

    <filter>
        <filter-name>CorsFilter</filter-name>
        <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
        <init-param>
            <param-name>cors.allowed.origins</param-name>
            <param-value>*</param-value>
        </init-param>
        <init-param>
            <param-name>cors.allowed.methods</param-name>
            <param-value>GET,POST,HEAD,OPTIONS,PUT</param-value>
        </init-param>
        <init-param>
            <param-name>cors.allowed.headers</param-name>
            <param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
        </init-param>
        <init-param>
            <param-name>cors.exposed.headers</param-name>
            <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Methods</param-value>
        </init-param>

        <init-param>
            <param-name>cors.preflight.maxage</param-name>
            <param-value>10</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CorsFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

但是 Access-Control-Allow-Methods: GET,POST,HEAD,OPTIONS,PUT 这个头死活上不去(如图)，有没有大佬知道是什么原因呀？