docs: def accept(self):
          """
          Equivalent to socket.accept(), but transforms the socket into a
          websocket instance and sends a server handshake (after receiving a
          client handshake). Note that the handshake may raise a HandshakeError
          exception.
          """
          sock, address = self.sock.accept()
          wsock = websocket(sock)
          wsock.secure = self.secure
          ServerHandshake(wsock).perform(self)
          wsock.handshake_sent = True
          return wsock, address