A better approach is to use a Redis or SQL Server distributed cache, which doesn't require sticky sessions. However, sticky sessions can affect scalability and complicate web app updates. Azure App Service uses Application Request Routing (ARR) to enforce sticky sessions by default. Use sticky sessions to tie each session to a specific app instance on an individual server.The in-memory cache provider stores session data in the memory of the server where the app resides. The next user might continue to browse the app with the same session cookie. A session might not be restricted to a single user. Some browsers maintain valid session cookies across browser windows. The user might not close the browser and clear the session cookie. Note: There is no replacement for the cookieless session feature from the ASP.NET Framework because it's considered insecure and can lead to session fixation attacks.ĭon't store sensitive data in session state.For more information, see General Data Protection Regulation (GDPR) support in ASP.NET Core. Session state isn't functional unless tracking is permitted by the site visitor. Session state cookies aren't marked essential by default.There's no default mechanism to inform app code that a client browser has been closed or when the session cookie is deleted or expired on the client.Session data is deleted either when the ISession.Clear implementation is called or when the session expires.Where the data doesn't require permanent storage across sessions.That's specific to a particular session.Session state is ideal for storing user data: The app either sets the session timeout or uses the default value of 20 minutes. The app retains a session for a limited time after the last request.When a session isn't retained, a new session ID is generated for each new request. The session must have at least one value set to persist the session across requests. If a cookie is received for an expired session, a new session is created that uses the same session cookie.Session cookies are deleted when the browser session ends.The session cookie is specific to the browser.Session state exhibits the following behaviors: Is used by the app to fetch the session data.For example, this can occur when a long polling request is held open by a hub beyond the lifetime of the request's HTTP context.ĪSP.NET Core maintains session state by providing a cookie to the client that contains a session ID. Session isn't supported in SignalR apps because a SignalR Hub may execute independent of an HTTP context. Critical application data should be stored in the user database and cached in session only as a performance optimization. The site should continue to function without the session data. The session data is backed by a cache and considered ephemeral data. Session state uses a store maintained by the app to persist data across requests from a client. Session state is an ASP.NET Core scenario for storage of user data while the user browses a web app. See the European Union General Data Protection Regulations (GDPR) when issuing cookies and dealing with privacy concerns. The cookie can be used to access the user's personalized settings, such as their preferred website background color. The cookie can store the user's name, account name, or unique user ID such as a GUID. The user is only identified and not authenticated in most cases. However, cookies are generally the most durable form of data persistence on the client.Ĭookies are often used for personalization, where content is customized for a known user. Cookies can be deleted by users and expire on clients. Only a limited number of cookies are available for each domain.īecause cookies are subject to tampering, they must be validated by the app. Most browsers restrict cookie size to 4096 bytes. Ideally, only an identifier should be stored in a cookie with the data stored by the app. Because cookies are sent with every request, their size should be kept to a minimum. CookiesĬookies store data across requests. For more information and alternative state management approaches for Blazor Server apps, see ASP.NET Core Blazor state management. SignalR apps can store per-connection state in Context.Items in the hub. SignalR apps shouldn't use session state and other state management approaches that rely upon a stable HTTP context to store information. SignalR/Blazor Server and HTTP context-based state management May include data stored using server-side app code. Each approach is described later in this article. State can be stored using several approaches. This article describes several approaches to preserve user data between requests. By default, HTTP requests are independent messages that don't retain user values. By Rick Anderson, Kirk Larkin, and Diana LaRose
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