cookie_domain => the_host()
in the MyApp config, but when I try to start the server it gives an error
telling that I can't use the method "req" because $c is undefined.
I'd be curious about why you wanted the cookie domain in the config anyway!

I presume you've got a bit of code like:

$c->response->cookies->{'foo'} = { domain => $c->config('cookie_domain') };

In which case why couldn't you just do

$c->response->cookies->{'foo'} = { domain => $c->req->hostname };
But anyway, what I need is working because I can avoid setting a domain
name for the cookie.
Yeah exactly, setting the domain in the cookie to match the domain requested
is pretty pointless anyway as that's what browsers do by default. About the
only time you need to send a domain back is when you want to set a cookie
across all subdomains or similar. Eg: { domain => '.example.com' }


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