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We have our site integrated as an iframe into another site that runs on a different domain. It seems that we cannot set cookies. Has anybody encountered this issue before? Any ideas?
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You cannot share cookies across domains. You can however allow all subdomains to have access.
Generally, web application allows script running between pages(parent and iframe pages) in the same domain based on same-origin-policy. Unfortunately it does not support scripts if different domain. The policy does not allow it.
As you may know, cookie can't be set in a different domain from another domain directly. If you're having multiple sites in where you need to set a cookie from a parent site, you can use basic HTML and JS to set the cookies.
Since your content is being loaded into an iframe from a remote domain, it is classed as a third-party cookie.
The vast majority of third-party cookies are provided by advertisers (these are usually marked as tracking cookies by anti-malware software) and many people consider them to be an invasion of privacy. Consequently, most browsers offer a facility to block third-party cookies, which is probably the cause of the issue you are encountering.
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From new update of Chromium in February 4, 2020 (Chrome 80). Cookies default to SameSite=Lax. According to this link.
To fix this, you just need to mark your cookies are SameSite=None and Secure.
To understand what is Samesite cookies, please see this document
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