### 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_
"""Insert a substring into an existing string at a certain index."""
    return "%s%s%s" % (string[:index], content, string[index:])
def str_remove(string, index, end_index=None):
    """Remove a substring from an existing string at a certain from-to index range."""
    end_index = end_index or (index + 1)
    return "%s%s" % (string[:index], string[end_index:])
def str_startswith_ignore_case(value: str, prefix: str) -> bool:
    return value[: len(prefix)].lower() == prefix.lower()
def last_index_of(array, value):
    """Return the last index of `value` in the given list, or -1 if it does not exist."""
    result = -1
    for i in reversed(range(len(array))):
        entry = array[i]
        if entry == value or (callable(value) and value(entry)):
            return i
    return result
def is_sub_dict(child_dict: Dict, parent_dict: Dict) -> bool:
    """Returns whether the first dict is a sub-dict (subset) of the second dict."""
    return all(parent_dict.get(key) == val for key, val in child_dict.items())
def not_none_or(value: Any, alternative: Any) -> Any:
    """Return 'value' if it is not None, or 'alternative' otherwise."""
    return value if value is not None else alternative
def cleanup(files=True, env=ENV_DEV, quiet=True):
    if files:
        cleanup_tmp_files()
def cleanup_threads_and_processes(quiet=True):