After modifying the header and re-routing, the CORS policy fails to take effect.

[zukadong]

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[johnlanni]

嗯，现在如果没有经过decodeHeader阶段，cors在encodeHeader阶段的逻辑就无法生效。
因为修改header前匹配的路由（也可能没有匹配到路由），没有开启cors，而cors filter的decodeHeader阶段已经执行了，所以后面修改header匹配到新的路由后，cors filter的decodeHeader阶段不会执行，cors功能就无法生效了。
我们会修改下 envoy的代码来解决这个问题。

短期解决方案可以：

1. 给修改header前匹配的路由配置上cors
2. 使用 cors 插件，并域名级开启

[wilkinszhang]

I want to have a try, plz assign to me, thanks.

[johnlanni]

@wilkinszhang

I want to have a try, plz assign to me, thanks.

Regarding the changes to envoy, if you have any issues, feel free to reach out to me on DingTalk. My DingTalk ID is: chengtanzty