How to use the eel.btl.route function in Eel

@eel.btl.route('/authorize')
def _authorize_rmd_token():
	state = eel.btl.request.query.state
	print('New refresh code request: ', state, eel.btl.request.query.code)
	if state.strip() == settings.get('auth.oauth_key').strip():
		code = eel.btl.request.query.code
		print('Saving new reddit code.')
		refresh = praw_wrapper.get_refresh_token(code)
		if refresh:
			settings.put('auth.refresh_token', refresh)
			praw_wrapper.init()
			praw_wrapper.login()
			return 'Saved authorization token! Close this page to continue.'
	return 'Cannot save the new auth key, something went wrong.<br><a href="../index.html">Back</a>'

@eel.btl.route('/file')
def _downloaded_files():
	""" Allows the UI to request files RMD has scraped.
		In format: "./file?id=file_token"
	"""
	token = eel.btl.request.query.id
	file_obj = _session.query(sql.File).filter(sql.File.id == token).first()
	file_path = file_obj.path
	response = eel.btl.static_file(file_path, root=os.path.abspath(settings.get("output.base_dir")))
	response.set_header("Cache-Control", "public, max-age=0")
	return response