### 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_
if os.path.exists(file_path):
        return load_file(file_path)
    content = "{}" if content is None else content
    try:
        save_file(file_path, content, permissions=permissions)
        return content
    except Exception:
        pass
def replace_in_file(search, replace, file_path):
    """Replace all occurrences of `search` with `replace` in the given file (overwrites in place!)"""
    content = load_file(file_path) or ""
    content_new = content.replace(search, replace)
    if content != content_new:
        save_file(file_path, content_new)
def to_str(obj: Union[str, bytes], encoding: str = DEFAULT_ENCODING, errors="strict") -> str:
    """If ``obj`` is an instance of ``binary_type``, return
    ``obj.decode(encoding, errors)``, otherwise return ``obj``"""
    return obj.decode(encoding, errors) if isinstance(obj, six.binary_type) else obj
def to_bytes(obj: Union[str, bytes], encoding: str = DEFAULT_ENCODING, errors="strict") -> bytes:
    """If ``obj`` is an instance of ``text_type``, return
    ``obj.encode(encoding, errors)``, otherwise return ``obj``"""
    return obj.encode(encoding, errors) if isinstance(obj, six.text_type) else obj
def str_to_bool(value):
    """Return the boolean value of the given string, or the verbatim value if it is not a string"""
    true_strings = ["true", "True"]
    if isinstance(value, str):
        return value in true_strings
    return value
def str_insert(string, index, content):