### 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_
"""Dummy object that can be arbitrarily accessed - any attributes, as a callable, item assignment, ..."""
    def __init__(self, name=None):
        self.name = name
    def __getattr__(self, name, *args, **kwargs):
        return ArbitraryAccessObj(name)
    def __call__(self, *args, **kwargs):
        if self.name in ["items", "keys", "values"] and not args and not kwargs:
            return []
        return ArbitraryAccessObj()
    def __getitem__(self, *args, **kwargs):
        return ArbitraryAccessObj()
    def __setitem__(self, *args, **kwargs):
        return ArbitraryAccessObj()
class HashableList(list):
    """Hashable list class that can be used with dicts or hashsets."""
    def __hash__(self):
        result = 0
        for i in self:
            result += hash(i)
        return result
class FileMappedDocument(dict):