(clackup (builder
(<clack-middleware-logger>
:logger (make-instance '<clack-logger-stream>))
(lambda (env)
(log-message :notice "You've got an access!")
'(200 nil ("ok"))))) Clack.Logger.Stream is a logger the outputs log messages to a stream, using *standard-output* as the default.
This logger is used in Clack.Middleware.Logger as the default logger.
Output log messages to 'output-stream' in this slot.