Help for web.app.build_url

def build_url(*args, **kwargs):
    path = "/".join(str(a).strip("/") for a in args if a)
    endpoint = current_endpoint()
    if endpoint:
        url = f"/{endpoint}/{path}" if path else f"/{endpoint}"
    else:
        url = f"/{path}"
    if kwargs:
        url += "?" + urlencode(kwargs)
    return url