How to use the httpie.plugins.plugin_manager.get_auth_plugin function in httpie

if self.args.auth is None and not auth_type_set:
            if url.username is not None:
                # Handle http://username:password@hostname/
                username = url.username
                password = url.password or ''
                self.args.auth = AuthCredentials(
                    key=username,
                    value=password,
                    sep=SEP_CREDENTIALS,
                    orig=SEP_CREDENTIALS.join([username, password])
                )

        if self.args.auth is not None or auth_type_set:
            if not self.args.auth_type:
                self.args.auth_type = default_auth_plugin.auth_type
            plugin = plugin_manager.get_auth_plugin(self.args.auth_type)()

            if plugin.auth_require and self.args.auth is None:
                self.error('--auth required')

            plugin.raw_auth = self.args.auth
            self.args.auth_plugin = plugin
            already_parsed = isinstance(self.args.auth, AuthCredentials)

            if self.args.auth is None or not plugin.auth_parse:
                self.args.auth = plugin.get_auth()
            else:
                if already_parsed:
                    # from the URL
                    credentials = self.args.auth
                else:
                    credentials = parse_auth(self.args.auth)

if self.args.auth is None and not auth_type_set:
            if url.username is not None:
                # Handle http://username:password@hostname/
                username = url.username
                password = url.password or ''
                self.args.auth = AuthCredentials(
                    key=username,
                    value=password,
                    sep=SEP_CREDENTIALS,
                    orig=SEP_CREDENTIALS.join([username, password])
                )

        if self.args.auth is not None or auth_type_set:
            if not self.args.auth_type:
                self.args.auth_type = default_auth_plugin.auth_type
            plugin = plugin_manager.get_auth_plugin(self.args.auth_type)()

            if plugin.auth_require and self.args.auth is None:
                self.error('--auth required')

            plugin.raw_auth = self.args.auth
            self.args.auth_plugin = plugin
            already_parsed = isinstance(self.args.auth, AuthCredentials)

            if self.args.auth is None or not plugin.auth_parse:
                self.args.auth = plugin.get_auth()
            else:
                if already_parsed:
                    # from the URL
                    credentials = self.args.auth
                else:
                    credentials = parse_auth(self.args.auth)

if self.args.auth is None and not auth_type_set:
            if url.username is not None:
                # Handle http://username:password@hostname/
                username = url.username
                password = url.password or ''
                self.args.auth = AuthCredentials(
                    key=username,
                    value=password,
                    sep=SEPARATOR_CREDENTIALS,
                    orig=SEPARATOR_CREDENTIALS.join([username, password])
                )

        if self.args.auth is not None or auth_type_set:
            if not self.args.auth_type:
                self.args.auth_type = default_auth_plugin.auth_type
            plugin = plugin_manager.get_auth_plugin(self.args.auth_type)()

            if plugin.auth_require and self.args.auth is None:
                self.error('--auth required')

            plugin.raw_auth = self.args.auth
            self.args.auth_plugin = plugin
            already_parsed = isinstance(self.args.auth, AuthCredentials)

            if self.args.auth is None or not plugin.auth_parse:
                self.args.auth = plugin.get_auth()
            else:
                if already_parsed:
                    # from the URL
                    credentials = self.args.auth
                else:
                    credentials = parse_auth(self.args.auth)