#
    set $isluci "0";
    set $canproxy "0";
    set $browser "0";
    set $need_redirect "0";
    #
    set $finalvar "";
    set $web_init "";
    set $redirect_flag "";
    #

    #
    set $target_upstream "unknow-http-host";
    #
    if ($http_host) {
      set $target_upstream $http_host;
    }
    #
    if ($http_host = "api.miwifi.com"){
      #
      break;
      #
    }
    if ($http_host = "www.miwifi.com"){
      #
      rewrite ^(.*)$ $scheme://miwifi.com? break;
      #
    }
    # xiaoqiang doesn't act as htp server
    if ($http_host = "htp.miwifi.com"){
        # close connection directly, without response
        return 444;
    }

    # 0.0.0.1:65535 no avaible
    #
    if ($server_port != "8098"){
      #
      #it is NOT REDIRECT from WEBINITRDR, enable proxy
      #
      set $canproxy "1";
      #
    }

    if ($server_port = "8098"){
      #
      set $isluci "0";
      #
    }

    if ($http_host = "miwifi.com"){
      set $isluci "1";
    }

    if ($http_host = "wifi.cmcc"){
      set $isluci "1";
    }

    if ($http_host = "miwifi.com:8098"){
      set $isluci "1";
    }

    if ($http_host = "xiaoqiang") {
      set $isluci "1";
    }

    if ($http_host = "localhost"){
      #
      set $isluci "1";
      #
      set $canproxy "0";
    }

    if ($host = $server_addr){
      #
      set $isluci "1";
      #
    }
    if ($remote_addr = $server_addr){
      #
      set $isluci "1";
      #
      set $canproxy "0";
      #
    }
    if ($remote_addr = "127.0.0.1"){
      #
      set $isluci "1";
      set $canproxy "0";
    }
    if ($remote_addr = "169.254.31.1"){
      #
      set $isluci "1";
      set $canproxy "0";
    }
    if ($remote_addr = "169.254.31.2"){
      #
      set $isluci "1";
      set $canproxy "0";
    }

    #=================================================
    # Most Andriod, xiaomi meizu...  
    location ~* /generate_204 {
        set $need_redirect "1";
    }

    if ($request_uri = "/generate_204"){
         #keepalive_timeout 0;
         #trunked_transfer_encoding on;
         #rewrite ^/(.*)$ http://miwifi.com/cgi-bin/luci/web/init/? break;
         set $need_redirect "1";
    }
    # http://connectivitycheck.android.com/generate_204
    if ($http_host = "connectivitycheck.android.com"){
        set $need_redirect "1";
    }

    # Huawei stations
    if ($http_host = "www.google.com"){
        set $need_redirect "1";
    }
    if ($http_host = "www.baidu.com"){
        set $need_redirect "1";
    }
    if ($http_host = "www.youku.com"){
        set $need_redirect "1";
    }

    # Huawei mate9
    if ($http_host = "appdlc.hicloud.com"){
        set $need_redirect "1";
    }
    # Huawei p9
    if ($http_host = "go.10086.cn"){
        set $need_redirect "1";
    }
    # Honer 7
    # location ~* /wifi/cw.html {
    if ($request_uri = "/cw.html"){
        set $need_redirect "1";
    }

    # Huawei P8
    if ($http_host = "tools.3g.qq.com"){
        set $need_redirect "1";
    }
    if ($http_host = "nstool.netease.com"){
        set $need_redirect "1";
    }
    if ($http_host = "andmlbf.tj.ijinshan.com"){
        set $need_redirect "1";
    }
    if ($http_host = "superwifi.uodoo.com"){
        set $need_redirect "1";
    }

    # Huawei nova 2s
    # http://pms.mb.qq.com/rsp204
    if ($request_uri = "/rsp204"){
        set $need_redirect "1";
    }

    # Windows 10
    if ($request_uri = "/connecttest.txt"){
        set $need_redirect "1";
    }

    # Ios & Mac
    # iphoneSE ok
    if ($request_uri = "/hotspot-detect.html"){
        set $need_redirect "1";
    }
    # Mac air
    # http://captive.apple.com/9PKNOUXBu/R7MHe2CQN/rYzFX91CW.html
    # http://captive.apple.com/OJuct5VbaVJDcY/XAe70lsN0fSjX6/mpANOgjLN40nqy/dnbwYE7OXr1bDU.html
    #if ($request_uri = "/hotspot-detect.html"){
    if ($http_host = "captive.apple.com"){
        set $need_redirect "1";
    }
    # http://www.thinkdifferent.us/oiWW89oMQMPKs/zCYinf5De6nHS/10XywYwXYaBRC.html
    if ($http_host = "www.thinkdifferent.us"){
        set $need_redirect "1";
    }
    # http://www.appleiphonecell.com/PHOCYq0enfJ3bL/ClRGRo6bfDzVyD/cI8HKTRNv8pTxP/2boZiUFgrvgXew/GeZg0rzZ8Szu3E.html
    if ($http_host = "www.appleiphonecell.com"){
        set $need_redirect "1";
    }

    if ($http_host = "www.itools.info"){
        set $need_redirect "1";
    }

    if ($http_host = "gsp1.apple.com"){
        set $need_redirect "1";
    }

    if ($http_host = "www.airport.us"){
        set $need_redirect "1";
    }

    if ($http_host = "push.apple.com"){
        set $need_redirect "1";
    }

    # if post, return 401
    #if ($request_method = POST) {
    #     return 401;
    #}

    # Redirect for browser
    if ($http_user_agent ~* "Mozilla|AppleWebKit|Chrome|Safari") {
        set $browser "1";
    }

    # for need_redirect flag
    set $redirect_flag "$canproxy $isluci $need_redirect";
    if ($redirect_flag = "0 0 1") {
        rewrite ^(.*)$ http://miwifi.com/init.html? break;
    }

    # from browser and not luci not proxy
    set $web_init "$canproxy $isluci $browser";
    if ($web_init = "0 0 1") {
        rewrite ^(.*)$ http://miwifi.com/init.html? break;
    }

    set $finalvar "$canproxy $isluci";
    # '0 0' is no access to webadmin, but come from webinitrdr, redirect to web init
    if ($finalvar = "0 0") {
        rewrite ^(.*)$ http://miwifi.com/init.html? break;
        #rewrite ^(.*)$ http://miwifi.com/cgi-bin/luci/web/init/hello? break;
        #rewrite ^(.*)$ http://miwifi.com/webinitrdr.html?webinitrdr=yes? break;
        #rewrite ^(.*)$ /webinitrdr.html?webinitrdr=yes? break;
    }

    # or client requesting us because it cached DNS result, proxy to upstream by http_host
    # to prevent miss cache
    if ($finalvar = "1 0") {
            rewrite ^(.*)$ /miwifi-goto-autoproxy.html? break;
    }

    # new init page
    location /init.html {
      #
      expires epoch;
      keepalive_timeout  0;
      add_header Cache-Control  'private,max-age=0';
      add_header Content-Type "text/html;charset=utf-8";
    }

    #
    #add_header MiCGI-Switch "$finalvar";
    #add_header MiCGI-TproxyInfo "$dst_addr:$dst_port";
    #add_header MiCGI-Upstream "$target_upstream";
    #add_header  MiCGI-Client-Ip $remote_addr;
    #add_header  MiCGI-Host $host;
    #add_header  MiCGI-Http-Host $http_host;
    #add_header  MiCGI-Server-Ip $server_addr;
    #add_header  MiCGI-Server-Port $server_port;
    #add_header  MiCGI-Status LUAROOT;
    #add_header  MiCGI-Preload no;
    #
    location /miwifi-goto-autoproxy.html {
      #
      internal;
      keepalive_timeout  0;
      #
      resolver 127.0.0.1;
      #
      add_header MiCGI-Switch "$finalvar";
      #add_header MiCGI-TproxyInfo "$dst_addr:$dst_port";
      add_header MiCGI-Upstream "$target_upstream";
      add_header MiCGI-Client-Ip $remote_addr;
      add_header MiCGI-Host $host;
      add_header MiCGI-Http-Host $http_host;
      add_header MiCGI-Server-Ip $server_addr;
      add_header MiCGI-Server-Port $server_port;
      add_header MiCGI-Status AUTOPROXY;
      add_header MiCGI-Preload no;
      #
      proxy_redirect off;
      #
      proxy_set_header Host $target_upstream;
      #
      proxy_pass http://$target_upstream/$request_uri;
      #
    }
    location /webinitrdr.html {
      #
      expires epoch;
      keepalive_timeout  0;
      #
      add_header MiCGI-Switch "$finalvar";
      #add_header MiCGI-TproxyInfo "$dst_addr:$dst_port";
      add_header MiCGI-Upstream "$target_upstream";
      add_header  MiCGI-Client-Ip $remote_addr;
      add_header  MiCGI-Host $host;
      add_header  MiCGI-Http-Host $http_host;
      add_header  MiCGI-Server-Ip $server_addr;
      add_header  MiCGI-Server-Port $server_port;
      add_header  MiCGI-Preload no;
      #
      add_header  MiCGI-Status WEBINITRDR;
      add_header Cache-Control  'private,max-age=0';
      add_header Content-Type "text/html;charset=utf-8";
      #
      #return 503;
      #
    }
    location /diagnosis {
       expires -1;
       add_header  MiCGI-Host $host;
       add_header  MiCGI-Http-Host $http_host;
       add_header Content-Type "text/html;charset=utf-8";
       root /www/xiaoqiang/;
       index  index.html;
    }

    #