# File lib/fog/aws/requests/lambda/invoke.rb, line 43
        def invoke(params={})
          response = Excon::Response.new
          response.status = 200
          response.body = ''

          unless function_id = params.delete('FunctionName')
            message = 'AccessDeniedException => '
            message << 'Unable to determine service/operation name to be authorized'
            raise Fog::AWS::Lambda::Error, message
          end

          client_context = params.delete('ClientContext')
          client_type    = params.delete('InvocationType')
          log_type       = params.delete('LogType')
          payload        = params.delete('Payload')

          if (client_context || client_type || log_type)
            message = "invoke parameters handling are not yet mocked [light_black](#{caller.first})[/]"
            Fog::Logger.warning message
            Fog::Mock.not_implemented
          end

          if payload
            message = "payload parameter is ignored since we are not really "
            message << "invoking a function [light_black](#{caller.first})[/]"
            Fog::Logger.warning message
          end

          function = self.get_function_configuration('FunctionName' => function_id).body

          if function.is_a?(Hash) && function.has_key?('FunctionArn')
            response.body = "\"Imagine #{function['FunctionArn']} was invoked\""
          else
            message = "ResourceNotFoundException => Function not found: #{function_id}"
            raise Fog::AWS::Lambda::Error, message
          end

          response
        end