Class InvalidState

src/websockets/exceptions.py:435–447

Raised when sending a frame is forbidden in the current state. Specifically, the Sans-I/O layer raises this exception when: * sending a data frame to a connection in a state other :attr:`~websockets.protocol.State.OPEN`; * sending a control frame to a connection in a state o

class InvalidState(WebSocketException, AssertionError):
    """
    Raised when sending a frame is forbidden in the current state.

    Specifically, the Sans-I/O layer raises this exception when:

    * sending a data frame to a connection in a state other
      :attr:`~websockets.protocol.State.OPEN`;
    * sending a control frame to a connection in a state other than
      :attr:`~websockets.protocol.State.OPEN` or
      :attr:`~websockets.protocol.State.CLOSING`.

    """


class ConcurrencyError(WebSocketException, RuntimeError):