### Is there an existing issue for this?

- [X] I have searched the existing issues and read the documentation

### Question

Using a websocket apigatewayv2 in localstack and i need to change the body of the request e.g. add the connectionid, which is something i can do with a HTTP integration on the AWS gateway, however when I try this with localstack i receive the following error "Unsupported integration type "HTTP" for Websocket API ID" and then prints the ID of the API, if this feature is not enabled then how should we test the actual API where the connectionId and other things are added to the request body

### Anything else?

_No response_
data: Union[Response, bytes],
    templates: Dict[str, str],
    content_type: str = None,
    as_json: bool = False,
):
    """Apply the matching request/response template (if it exists) to the payload data and return the result"""
    content_type = content_type or APPLICATION_JSON
    is_response = isinstance(data, Response)
    templates = templates or {}
    template = templates.get(content_type)
    if not template:
        return data
    content = (data.content if is_response else data) or ""
    result = aws_stack.render_velocity_template(template, content, as_json=as_json)
    if is_response:
        data._content = result
        update_content_length(data)
        return data
    return result
def is_test_invoke_method(method, path):
    return method == "POST" and bool(re.match(PATH_REGEX_TEST_INVOKE_API, path))
UPDATE_APIGATEWAY = ProxyListenerApiGateway()