@event_source(data_class=APIGatewayProxyEvent)
def lambda_handler(event: APIGatewayProxyEvent, context: LambdaContext):
    logger.append_keys(user_agent=event.get_header_value("user-agent", "[No User-Agent]"))
    return app.resolve(event.raw_event, context)

    return app.resolve(event, context)

@event_source(data_class=APIGatewayProxyEvent)
def lambda_handler(event: APIGatewayProxyEvent, context: LambdaContext):
    logger.append_keys(user_agent=event.get_header_value("user-agent", "[No User-Agent]"))
    return app.resolve(event.raw_event, context)

@event_source(data_class=APIGatewayProxyEvent)
def lambda_handler(event: APIGatewayProxyEvent, context: LambdaContext):
    logger.append_keys(user_agent=event.get_header_value("user-agent", "[No User-Agent]"))
    return app.resolve(event, context)

class CustomProxyEvent(BaseProxyEvent):
    def __init__(self, data: dict[str, Any], json_deserializer: Optional[Callable]=None):
        data_wrapper = {"path": "", "httpMethod": data["action"], "body": json.dumps(data)}
        super().__init__(data_wrapper, json_deserializer)
        self._json_data = data

    @property
    def action(self) -> str:
        return cast(str, cast(dict, self._json_data)["action"])

    @property
    def content(self) -> str:
        return cast(str, cast(dict, self._json_data)["content"])

    # Unfortunately this must still be provided unless we mark it as optional.
    # I have a separate commit prepared, if you are willing to consider I can include it
    def header_serializer(self) -> BaseHeadersSerializer:
        return MultiValueHeadersSerializer()

app = ApiGatewayResolver(debug=True)
logger = Logger()

@app.route("", "foo")
def group_stats_get() -> Response:
    return Response(200, body=app.current_event.content)

@event_source(data_class=CustomProxyEvent)
def handler(event: CustomProxyEvent, context: LambdaContext):
    logger.append_keys(action=event.action)
    return app.resolve(event, context)