anchor.diff:  <% if govuk_platform == 'production' %>
  +
  +<% whitehall_paths = %w[ /government /bis /cabinetoffice /dclg /mod /defra /fco /dh /dfid /moj /hmrc ] %>
   
   <% frontend_hosts = (govuk_platform == 'production') ? ['frontend.cluster', 'frontend.cluster-1', 'frontend.cluster-2'] : ['frontend.cluster'] %>
   
  
positive.code:   <% end %>
  }
  
  backend whitehall {
    .host = "whitehall.cluster";
    .port = "8085";
    .probe = {
      .url = "/government";
      .interval = 5s;
      .timeout = 1s;
      .window = 5;
      .threshold = 3;
    }
  }
  
  <% else %>
  
  
negative.code:     set req.backend = calendars;
    } else if (req.url ~ "/calculate-your-holiday-entitlement|/student-finance-calculator|/inherits-someone-dies-without-will|/maternity-benefits|/calculate-married-couples-allowance") {
      set req.backend = smartanswers;
    } else if (req.url ~ "^/government\/|<%= whitehall_paths.map { |p| "^#{p}$" }.join("|") %>") {
      set req.backend = whitehall;
    } else if (req.url ~ "^/maternity(\.xml|\.json|\.ics)?(\?.*|)$|^/paternity(\.xml|\.json|\.ics)?(\?.*|)$") {
      set req.backend = planner;
  