Correctly handle unicode parameters

    def do_PUT(self):

        if self.path == '/create-account' or self.path == '/create-account/':

            length = int(self.headers['Content-Length'])

            postvars = urllib.parse.parse_qs(self.rfile.read(length))

            postvars = {k.decode(): v[0].decode() for k, v in postvars.items()}

            print(f'Received request PUT /create-account, parameters {postvars}')

            query = self.rfile.read(length)

            postvars = dict(urllib.parse.parse_qsl(query.decode()))

            if postvars['auth'] != os.environ['CREATE_ACCOUNT_PASSWORD']:

                data = json.dumps({'success': False, 'message': 'no_auth'})

                self.respond(401, data)