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The website I'm working on has 5 domains (two top level and 3 subs, not including www). I need to limit the cookie that the site creates to only work on 4 of the domains.

I have found from here that in Drupal 8 cookies are defined in the services.yml file using this:

parameters:
  session.storage.options:
    cookie_domain: '.domain.com'

But I'm unsure how I can add multiple domains. Is it as simple as something like this?

cookie_domain: 'www.domain1.com'; 'domain1.com'; 'sub1.domain.com'; 'sub2.domain.com'
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A cookie can only have 1 domain value. So you can either set it to a specific domain or the top domain wich includes all the subdomains.

See https://stackoverflow.com/questions/1062963/how-do-browser-cookie-domains-work

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    That doesn't really answer the question and your answer is contradictory. If I set it to the top level domain then more than 1 domain can be used i.e a global cookie. How do I limit it to only specific sub domains? – Krypton May 28 '17 at 11:08
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    Further more, drupal handles assigning cookies for both my top level domains without this setting, how would I replicate this if I were to use the cookie_domain value so cookies won't work on sub domains? – Krypton May 28 '17 at 11:19
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    The answer seems clear, to me: Or you set cookie_domain to .example.com, which means all the sub-domains of example.com (including example.com), or you set it to sub.example.com, or example.com, which makes the cookie just for a domain. – kiamlaluno May 28 '17 at 16:40
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    I know how cookies work but this isn't a cookie issue it's a dynamic drupal issue. Multi domain cookies could be used in earlier versions of drupal drupal.org/node/1348784 how do I do this in Drupal 8??? – Krypton May 29 '17 at 4:57
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    Without having the cookie_domain set, both of my top level domains handle logins fine, how would I replicate this setting? If I can only input one domain then the other will stop working. Also I apologies if I'm appearing blunt, I do appreciate any help :) – Krypton May 29 '17 at 5:05

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