anchor.diff:        req.http.user-agent ~ "Smithsonian-Public-GSA" ||
         req.http.user-agent ~ "PaperLiBot") {
           set req.backend = searchbots;
  -  } elseif (client.ip ~ unwanted) {
  -    error 410;
     } elseif (req.url ~ "/varnishboom" ) {
       return(error);
   # API requests:
  
positive.code: 
  # blacklist of specific IP addresses that we have found to abuse our policies:
  acl unwanted {
    "68.180.228.106";
    "98.174.196.0"/24;
    "180.76.15.0"/24;
    "144.76.195.74";
  }
  
  ##### Directors
  
negative.code:     }
    }
  # Search Bots:
    if (client.ip ~ unwanted) {
      error 410;
    } elseif (req.http.user-agent ~ "Googlebot" ||
        req.http.user-agent ~ "Googlebot-Mobile" ||
        req.http.user-agent ~ "Googlebot-Image" ||
        req.http.user-agent ~ "rogerbot" ||
  