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I do not think that he should overwrite vcl_hash. By default Varnish caches by the request host and not the backend host?

Here is the default:

sub vcl_hash { hash_data(req.url); if (req.http.host) { hash_data(req.http.host); } else { hash_data(server.ip); } return (hash); }

it caches by host. this would allow you to serve multiple sites through it like:

example.com/foo

and

another.com/foo

without a cache collision.

we don't care about the host as everything is of the same entity service type.

I must have scanned the blog post too quickly. Thanks for the clarification.