Can I set a cookie for a subdomain?

However, all modern browsers respect the newer specification RFC 6265, and will ignore any leading dot, meaning you can use the cookie on subdomains as well as the top-level domain.

Can one subdomain set cookie for another subdomain?

Cooking Sharing Between Subdomains (Shared-Session SSO) One way that applications can implement SSO is by sharing cookies across subdomains. Browser cookies can be shared across subdomains if their domain flag is set to a common parent domain. In this case, the cookie will be sent for any subdomain of facebook.com .

Can subdomain read domain cookies?

If you set a Domain attribute to the exact subdomain (e.g. application.example.com ), your browser will still interpret it as a wildcard, making the cookie valid for the subdomain and all of its subdomains (as in, it’ll show up as .

How do you set a cookie domain?

Set a cookie domain The domain can be used to specify a subdomain for your cookie. If not set, it defaults to the host portion even if using a subdomain (if on subdomain.mydomain.com, by default it’s set to mydomain.com). Domain cookies are included in subdomains.

Can you set a cookie from a subdomain?

Please everyone note that you can set a cookie from a subdomain on a domain. But you CAN’T set a cookie from a domain on a subdomain. WHY ? If the canonicalized request-host does not domain-match the domain-attribute: Ignore the cookie entirely and abort these steps. The domain string and the string are identical.

How to get a cookie for a domain in PHP?

PHP’s cookie functions automatically prefix the $domain with a dot. If you don’t want this behavior you could use the header function. For example: If you run your PHP script under ” http://subdomain.example.net “, don’t use the domain parameter: You will get a cookie with “subdomain.example.net” (and not “.subdomain.example.net”)

How to set SameSite cookie attribute in PHP?

If the samesite element is omitted, no SameSite cookie attribute is set. Path on the domain where the cookie will work. Use a single slash (‘/’) for all paths on the domain. Cookie domain, for example ‘www.php.net’. To make cookies visible on all subdomains then the domain must be prefixed with a dot like ‘.php.net’.

Can a cookie be shared between two domains?

The 2 domains example.com and foo.example.com can only share cookies if the domain is explicitly named in the Set-Cookie header. Otherwise, the scope of the cookie is restricted to the request host. Then the cookie won’t be sent for requests to example.com. However if you use the following, it will be usable on both domains: