SameSiteattribuutin

The SameSite attribute is a security mechanism for HTTP cookies. It was introduced to mitigate Cross-Site Request Forgery (CSRF) attacks. When a cookie is set with the SameSite attribute, the browser restricts when the cookie is sent with cross-site requests. This means that if a user visits a website other than the one that set the cookie, the browser might not send the cookie along.

There are three possible values for the SameSite attribute: Strict, Lax, and None. Strict is the most restrictive. If Strict is set, the cookie will only be sent if the request originates from the same site as the cookie. This means that even clicking a link from another website to a site with Strict cookies will not send the cookie. Lax is the default value in many modern browsers. With Lax, cookies are sent with top-level navigations (like clicking a link) and same-site requests, but not with requests initiated by third-party scripts or images. None is the least restrictive and requires the Secure attribute to be set. When None is used, the cookie is sent with all requests, including cross-site ones, but only if the connection is secure (HTTPS).

The SameSite attribute helps prevent sensitive information stored in cookies from being leaked or misused when a user navigates between different websites. Developers can specify the SameSite attribute when setting cookies in their web applications to enhance the security of their sites.