LCI in Varnish

lci.vcl

# LCI
sub vcl_fetch {
    # For successful unsafe responses
    if (beresp.status >= 200 && beresp.status < 400
    && (req.request == "PUT" || req.request == "POST" || req.request == "DELETE")) {
        # Purge all the resources marked for cascading purge
        ban("req.http.host == " + req.http.host + " && obj.http.link ~ <" + req.url + ">;.rel=.inv-by.");
    }
}