Cookie management

There has been a lot of debate lately regarding cookie management. Some notions first:

  • First party cookies are cookies which domain match the domain name of the website they are used on. For example, when visiting www.acme-corp.com website, a first party cookie would aim at the domain *.acme-corp.com
  • Third party cookies are cookies which domain match a domain name which is not the one of the website they are used on. For example when visiting www.acme-corp.com website, a third party cookie would aim a the domain *.advertising.com and when visiting www.other-company.com a Javascript from advertising.com might also make use of a *.advertising.com cookie.

The cookies we are using with Hermes are first party cookies. The Javascript that is executed is indeed hosted at hermes.allo-media.net but it will create a cookie matching the domain *.acme-corp.com. This is possible because the Javascript is loaded and executed by the document hosted at www.acme-corp.com.

For a same user, we would create another dedicated cookie if the user was to also visit www.other-company.com.

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