def step(self, action_str: str, timeout: float = 100) -> dict:
        """Execute an action in the browser environment and return the observation."""
        unique_request_id = str(uuid.uuid4())
        self.agent_side.send((unique_request_id, {'action': action_str}))
        start_time = time.time()
        while True:
            if should_exit() or time.time() - start_time > timeout:
                raise TimeoutError('Browser environment took too long to respond.')
            if self.agent_side.poll(timeout=0.01):
                response_id, obs = self.agent_side.recv()
                if response_id == unique_request_id:
                    return dict(obs)
Execute an action in the browser environment and return the observation.
openhands/runtime/browser/browser_env.py