nginx 转发到 域名

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需求：
转发 a.domain.com/aaa 到 b.domain.com/aaa

则在a.domain.com机器上配置nginx conf，如下

    location ~* (aaa) {
        resolver 114.114.114.114 valid=3600s;
        resolver_timeout 3s;
        set $ola "b.domain.com";

        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://$ola;
    }