def copy_headers_into(from_r, to_r):
    """
    Will copy desired headers from from_r to to_r
    :params from_r: a swob Request or Response
    :params to_r: a swob Request or Response
    """
    pass_headers = ['x-delete-at']
    for k, v in from_r.headers.items():
        if is_sys_or_user_meta('object', k) or pass_headers in k.lower():
            to_r.headers[k] = v
dataset/ETHPy150Open openstack/swift/swift/proxy/controllers/obj.py/copy_headers_into/swapped operands of `in`