Cookies include a hostname component that they relate to.
For security reasons a site in one domain cannot set a cookie in another domain, so if your Rumpus server is in a different domain from your web site, you are out of luck,
However, if they’re in the same domain, you can set a domain-wide cookie in the web page. This should then be passed through to Rumpus (and, indeed, any other web server in your domain).
Without know more about your network setup it’s impossible to advise more.
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