# File lib/fog/compute/requests/aws/deregister_image.rb, line 32
        def deregister_image(image_id)
          response = Excon::Response.new
          if image_id 
            response.status = 200
            response.body = {
              'requestId' => Fog::AWS::Mock.request_id,
              'return' => "true"
            }
            response
          else
            message = 'MissingParameter => '
            if !instance_id
              message << 'The request must contain the parameter image_id'
            end
            raise Fog::Compute::AWS::Error.new(message)
          end
        end