In my website (i.e. https://t.com) I have an iframe pointing to a website from another domain (i.e. https://a.com). This second website sets a cookie in my parent website when loading, but then it can´t read its own cookie.
So, my question is, how can I allow my second site, which is contained in the iframe, to access the cookie it has set when first loaded.
So, as you can see, when the content of the iframe is loaded, it sets a new cookie called sid.
But, when making a request within the iframe, that cookie is not being sent in the request headers.
