nginx 二级域名跳转

    server {
        listen       80;
        server_name  m.aaoo.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;
        rewrite ^/(.*)$ http://rmkj.xxxx.com/m_zxkj/$1 last;
        location / {
            #proxy_pass http://rmkj.xxxx.com;
            #Proxy Settings
            proxy_redirect     off;
            proxy_set_header   Host     $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
            proxy_max_temp_file_size 0;
            proxy_connect_timeout      90;
            proxy_send_timeout 9000;
            proxy_read_timeout 9000;
            proxy_buffer_size  4k;
            proxy_buffers      4 32k;
            proxy_busy_buffers_size    64k;
            proxy_temp_file_write_size 64k;
        }
        }

目标：通过访问m.aaoo.cn自动跳转至rmkj.xxxx.com/m_xxkj/