@app.get("/query/param")
def get_query_param(query=Query(default=None)):
    if query is None:
        return "foo bar"
    return f"foo bar {query}"


@app.get("/query/param-required")
def get_query_param_required(query=Query()):
    return f"foo bar {query}"


@app.get("/query/param-required/int")
def get_query_param_required_type(query: int = Query()):
    return f"foo bar {query}"