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173. Explain the cookie attribute: "SameSite".

SameSite is an attribute of a cookie that can be set to determine how the cookie should be sent by the browser when making cross-origin requests. It is a security feature introduced to protect against cross-site request forgery (CSRF) attacks.

When the SameSite attribute is set to "Strict", the cookie will only be sent by the browser if the request originates from the same site as the cookie domain. This means that the cookie will not be sent for cross-origin requests, helping to prevent CSRF attacks.

When the SameSite attribute is set to "Lax", the cookie will be sent for cross-origin GET requests, such as linking to an external site, but will not be sent for cross-site POST requests that modify state, such as submitting a form.

If the SameSite attribute is not specified, the browser will default to treating it as if "SameSite=Lax" was set.

It's important to note that the SameSite attribute is supported by most modern browsers, but older browsers may not fully support it. Additionally, not all cookies will have the SameSite attribute set, as it requires explicit configuration by the server-side application that sets the cookies.