SameSiteflagg

SameSiteflagg is not a widely recognized term in browser specifications, but it appears to refer to the SameSite cookie attribute, a mechanism used by web servers to control when cookies are sent with requests to a site. The SameSite attribute helps reduce the risk of cross-site request forgery by restricting how cookies are included in cross-origin requests, thus strengthening user session security.

The SameSite attribute can take several values. Strict means cookies are only sent in requests originating from the same site, providing the strongest protection but potentially breaking some cross-origin flows. Lax is more permissive: cookies are sent with top-level navigations to the site, but not with most cross-site subrequests. None allows cookies to be sent in cross-site contexts, which is necessary for certain third-party integrations, but such cookies must be marked Secure, meaning they are only sent over HTTPS.

In practice, developers set the attribute in the Set-Cookie response header, for example: Set-Cookie: sessionId=abc123; SameSite=Strict; Path=/ or Set-Cookie: sessionId=abc123; SameSite=None; Secure; Path=/; This configuration affects how authentication cookies and other session data are transmitted, influencing both security and user experience.

Browser support has matured across major engines (Chrome, Firefox, Safari, Edge), with modern defaults evolving to require explicit SameSite values. Some older or non-compliant browsers may ignore the attribute, so testing across environments remains important. A common security recommendation is to set SameSite to Lax for most session cookies while using None with Secure only for cases that require cross-site use, such as federated login or embedded content.

Note: if you encounter the term SameSiteflagg, it most likely refers to the SameSite cookie attribute described here, rather than a distinct standard or feature.