Request header field x-token is not allowed by Access-Control-Allow-Headers in preflight response.

问题：最近在做项目时，报错Request header field x-token is not allowed by Access-Control-Allow-Headers in preflight response，刚开始看到‘Access-Control-Allow-Headers’就觉得是跨域问题，跟后台联调才发现问题； 刚开始接口跨域是后台帮忙处理的，登录接口因为不需要传token，所

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