<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 async def connect(self, url, headers={}, transports=None, engineio_path='engine.io'):
 """Connect to an Engine.IO server. :param url: The URL of the Engine.IO server. It can include custom query string parameters if required by the server. :param headers: A dictionary with custom headers to send with the connection request. :param transports: The list of allowed transports. Valid transports are ``'polling'`` and ``'websocket'``. If not given, the polling transport is connected first, then an upgrade to websocket is attempted. :param engineio_path: The endpoint where the Engine.IO server is installed. The default value is appropriate for most cases. Note: this method is a coroutine. Example usage:: eio = engineio.Client() await eio.connect('http://localhost:5000') """

        if self.state != 'disconnected':
            raise ValueError('Client is not in a disconnected state')
        valid_transports = ['polling', 'websocket']
        if transports is not None:
            if isinstance(transports, six.text_type):
                transports = [transports]
            transports = [transport for transport in transports
                          if transport in valid_transports]
            if not transports:
                raise ValueError('No valid transports provided')
        self.transports = transports or valid_transports
        self.queue = self.create_queue()
        return await getattr(self, '_connect_' + self.transports[0])(
            url, headers, engineio_path)