```ruby
require "garner"
require "garner/mixins/mongoid"

module Mongoid
  module Document
    include Garner::Mixins::Mongoid::Document
  end
end```

Allow headers to be cached along with the response
user
```ruby
require "garner"
require "garner/mixins/mongoid"
require "garner/mixins/rack"

module Mongoid
  module Document
    include Garner::Mixins::Mongoid::Document
  end
end

# Monkey patch to cache headers until this is built into Garner
# https://github.com/artsy/garner/issues/54
module Garner
  module Cache
    class Identity
      TRACKED_HEADERS = %w{ Link X-Total-Count X-Total-Pages X-Current-Page X-Next-Page X-Previous-Page }

      alias_method :_fetch, :fetch
      def fetch(&block)
        if @key_hash[:tracked_grape_headers]
          result, headers = _fetch do
            result = yield
            headers = @ruby_context.header.slice(*TRACKED_HEADERS) if @ruby_context.respond_to?(:header)
            [result, headers]
          end

          (headers || {}).each do |key, value|
            @ruby_context.header(key, value) if @ruby_context.respond_to?(:header)
          end

          result
        else
          _fetch(&block)
        end
      end

    end
  end
end

module Garner
  module Mixins
    module Rack

      alias_method :_garner, :garner
      def garner(&block)
        response, headers = _garner.key({ tracked_grape_headers: true }, &block)
      end

    end
  end
end```
assistant