Altering the backend response ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here we override the TTL of a object coming from the backend if it matches certain criteria:: sub vcl_backend_response { if (bereq.url ~ "\.(png|gif|jpg)$") { unset beresp.http.set-cookie; set beresp.ttl = 1h; } } We also remove any Set-Cookie headers in order to avoid a `hit-for-pass` object to be created. See :ref:`user-guide-vcl_actions`.