anchor.diff:  
           limit_req zone=www burst=10;
           limit_req zone=tarpit burst=2;
  +        limit_req zone=reverse burst=5;
           limit_req_status 429;
           fastcgi_pass nominatim_service;
           include fastcgi_params;
  
positive.code:     2 $binary_remote_addr;
  }
  
  limit_req_zone $limit_www zone=www:50m rate=2r/s;
  limit_req_zone $limit_tarpit zone=tarpit:10m rate=1r/s;
  limit_req_zone $binary_remote_addr zone=blocked:10m rate=20r/m;
  
  server {
      listen 80 default_server;
  
negative.code: 
          limit_req zone=www burst=10;
          limit_req zone=tarpit burst=2;
          limit_req zone=reverse burst=5;
          limit_req_status 429;
          fastcgi_pass    nominatim_service;
          include         fastcgi_params;
  