Is this not possible to have a log file?

[lapinvert]

Like --access-log <path-to-file> and --error-log <path-to-file> of gunicorn.

Is this not possible? and what should we use instead?

[gi0baro]

@lapinvert logging configuration in Granian follows the logging standard library configuration.
You just need to customise the default handlers to use files in place of the stdout.

You can put such configuration in a JSON file and point Granian to it using the --log-config CLI option, or, in case you run Granian from Python, define a dict for that and pass it to the Granian class using the log_dictconfig parameter (https://github.com/emmett-framework/granian/blob/master/granian/server.py#L89).