SessionsURLs

SessionsURLs refers to a mechanism in which a session identifier is carried in the URL of each request, allowing a server to associate requests with a user session without relying on cookies. This approach originated in early web technologies and is still used in environments where cookies are blocked or unavailable, such as legacy CGI applications or certain mobile contexts, although it is less common in modern browsers.

In practice, a session URL usually includes a query parameter or a path segment that encodes a session ID, for example /checkout?sessionid=abc123 or /user/abc123/profile. The server uses this identifier to look up session state and validate the user across requests. Some frameworks also support path-based URLs where the session ID appears as part of the route. When a user navigates, each link must preserve the session identifier to maintain continuity.

Advantages of session URLs include compatibility with user agents that do not accept cookies and the ability to bookmark or share a specific state. However, they introduce significant security and privacy risks, such as leakage through the browser history, logs, and Referer headers, accidental exposure when sharing URLs, and increased susceptibility to session fixation if proper id generation and rotation are not enforced. They also complicate analytics and caching, since URLs vary per session.

Best practices typically favor cookies (preferably HttpOnly and Secure) or token-based authentication over URL-based sessions. If URL-based sessions are used, it is important to generate short-lived session IDs, rotate them on login, protect URLs from leakage, and disable their use when cookies are available.