Ability to log the HTTP referer

[simonw]

Unless I've missed something, it looks like it isn't currently possible to configure Uvicorn to output the HTTP Referer header in the access logs:

uvicorn/uvicorn/logging.py

Lines 109 to 132 in e77e596

	def formatMessage(self, record):
	recordcopy = copy(record)
	scope = recordcopy.__dict__["scope"]
	method = scope["method"]
	path = self.get_path(scope)
	full_path = self.get_full_path(scope)
	client_addr = self.get_client_addr(scope)
	status_code = self.get_status_code(recordcopy)
	http_version = scope["http_version"]
	request_line = "%s %s HTTP/%s" % (method, full_path, http_version)
	if self.use_colors:
	request_line = click.style(request_line, bold=True)
	recordcopy.__dict__.update(
	{
	"method": method,
	"path": path,
	"full_path": full_path,
	"client_addr": client_addr,
	"request_line": request_line,
	"status_code": status_code,
	"http_version": http_version,
	}
	)
	return super().formatMessage(recordcopy)

This would be really useful for me because I'm trying to figure out where traffic to my sites comes from without running Google Analytics!

[euri10]

you're correct, it should be in the socpe["headers"] if I'm not mistaken so that sounds feasible

[Kludex]

I recommend using a middleware to create the access logs, and disable the uvicorn.access logger.

This project can be used as inspiration: https://github.com/Kludex/asgi-logger.

PR is welcome to improve the documentation here. About the access logger formatter discussion, we'll continue on #527.