Re: [PATCH] Allow to specify a domain for a cookie

From: Patrick Viet <>
Date: Sun, 25 May 2008 22:59:55 +0200

On Sun, May 25, 2008 at 10:18 AM, Willy Tarreau <> wrote:

>> The underscore ("_") character is not RFC-valid but as it is
>> often (mis)used so I decided to allow it.
> OK for this too. Have you found situations where people try to use these
> chars, since they cannot put them in DNS records ? Maybe when they map
> windows server names into /etc/hosts ?

This is incorrect actually. Even though this is a very widespread belief, it's none the less a myth that the underscore cannot exist in DNS.
(examples in RFC 2782 - co-written by the original BIND writer Paul Vixie) The underscore can be used for symbolic names such as in the domainkeys technology ; just not for actually host names. So yes it can definitely be put in a DNS record (try dig,, and so on)

Nice patch by the way.
Expiration is probably a good idea.

Patrick Received on 2008/05/25 22:59

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