Varnish purge behind nginX proxy

[Bertrand Caplet]

> could you be missing a "import std;" ?
Yes I was, thanks :-)

But the if string here : 
https://www.varnish-cache.org/docs/4.0/reference/vmod_std.generated.html#ip-ip-string-ip
didn't work for me.

And for information this one works really well :
if (!std.ip(regsub(req.http.X-Forwarded-For, "[, ].*$", ""), client.ip)
~ purge)

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