User-friendly error pages from Varnish

Question

We are using Varnish at the front of Plone. In the case Plone goes down or serves an internal error we\'d like to show a user-friendly static HTML page which some CSS styling +

Answer 1

There isn't much help for doing this with Varnish 4 at the moment.

Here is what I ended up with:

sub vcl_backend_error {
    set beresp.http.Content-Type = "text/html; charset=utf-8";
    synthetic(std.fileread("/var/www/errors/500.html"));
    return (deliver);
}

For more info see the upgrading to 4.0 docs.