Oops, answering my own question here... we figured it out.  The
expression looks like this:

acl shard5 hdr_reg(Cookie) userState=ND

That'll use a back end called 'shard5' if there's a userState cookie
with the value ND

On 9/27/13 1:31 PM, Dave Shevett wrote:
> I've seen a couple posts (here and on stackoverflow) on checking to see
> if a cookie exists, and setting an ACL based on that, but not what value
> it has.
>
> Am I going to need to use a regexp to parse a header cookie line?  (I
> want to say 'if a cookie has value x, use backend x, if it has value y,
> use backend y).
>
> Thanks!
>
>     -d


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