# File lib/fog/aws/requests/storage/head_object_url.rb, line 5
        def head_object_url(bucket_name, object_name, expires, options = {})
          unless bucket_name
            raise ArgumentError.new('bucket_name is required')
          end
          unless object_name
            raise ArgumentError.new('object_name is required')
          end
          signed_url(options.merge({
            :bucket_name => bucket_name,
            :object_name => object_name,
            :method => 'HEAD'
          }), expires)
        end