BFE.devAI解答 - 前端面试问题
173. Explain the cookie attribute: "SameSite".

SameSite is a cookie attribute in web development that allows a website to specify how a cookie should be sent in cross-site requests. It is a security measure that helps protect against cross-site request forgery (CSRF) attacks.

When a cookie has the SameSite attribute set to "Strict", it means that the cookie will only be sent along with requests that originate from the same website. In other words, the cookie will not be included in cross-origin requests. This provides a level of protection against CSRF attacks, as the attacker will not be able to make requests on behalf of the user using their session cookie.

If the SameSite attribute is set to "Lax", the cookie will still be sent with same-site requests, but also with top-level navigation within the same site. It will not be sent with cross-site requests triggered by scripts, such as those initiated by an attacker on a different website.

However, if the SameSite attribute is not specified or set to "None", the cookie will be sent with every request, regardless of the origin. This behavior is more vulnerable to CSRF attacks and should be used with caution.

The SameSite attribute can be utilized along with the Secure attribute, which ensures that the cookie is only sent over secure HTTPS connections. By using both attributes together, website owners can further enhance the security of their applications.