问Prerender没有用Nginx检测令牌

EN

server {
  listen 443;
  server_name example.com;
  access_log /var/log/nginx/example.com.ssl.access.log;
  error_log /var/log/nginx/example.com.ssl.error.log debug;

  #SSL conf

  location / {

    try_files $uri @prerender;

    if ($request_filename ~* ^.*?/([^/]*?)$)
    {
        set $filename $1;
    }

    if ($filename ~* ^.*?\.(eot)|(ttf)|(woff)$){
        add_header Access-Control-Allow-Origin *;
    }

    proxy_redirect off;
    proxy_set_header   X-Real-IP            $remote_addr;
    proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
    proxy_set_header   X-Forwarded-Proto $scheme;
    proxy_set_header   Host                   $http_host;
    proxy_set_header   X-NginX-Proxy    true;
    proxy_set_header   Connection "";
    proxy_http_version 1.1;
    proxy_cache one;
    proxy_cache_key sfs$request_uri$scheme;

    proxy_pass http://example.com;
  }

  location @prerender {
      #proxy_set_header X-Prerender-Token YOUR_TOKEN;

      set $prerender 0;
      if ($http_user_agent ~* "baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest|slackbot|vkShare|W3C_Validator") {
          set $prerender 1;
      }
      if ($args ~ "_escaped_fragment_") {
          set $prerender 1;
      }
      if ($http_user_agent ~ "Prerender") {
          set $prerender 0;
      }
      if ($uri ~* "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)") {
          set $prerender 0;
      }

      #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
      resolver 8.8.8.8;

      if ($prerender = 1) {

          #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
          set $prerender "service.prerender.io";
          rewrite .* /$scheme://$host$request_uri? break;
          proxy_pass http://$prerender;
      }
      if ($prerender = 0) {
          rewrite .* /index.html break;
      }
  }

}