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I was wondering if HttpContext.Session uses cookies to store data. A work colleague told me that in a mobi site, phones generally do not have cookies and therefore you don't have session. I always thought session is data that is stored on the server side and is not dependant on client side objects please explain if I am wrong.
I read this.
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Cookies and Sessions are used to store information. Cookies are only stored on the client-side machine, while sessions get stored on the client as well as the server.
Cookies are client-side files that contain user information, whereas Sessions are server-side files that contain user information.
They're generally stored on the server. Where they're stored is up to you as the developer. You can use the session. save_handler configuration variable and the session_set_save_handler to control how sessions get saved on the server.
The session data that you read and write using $_SESSION is stored on server side, usually in text files in a temporary directory. They can not be accessed from outside.
In ASP.NET; you have a Session cookie. This cookie is used to identify which session is yours; but doesn't actually contain the session information.
By default, ASP.NET will store session information in memory inside of the worker process (InProc), typically w3wp.exe. There are other modes for storing session, such as Out of Proc and a SQL Server.
ASP.NET by default uses a cookie; but can be configured to be "cookieless" if you really need it; which instead stores your Session ID in the URL itself. This typically has several disadvantages; such as maintence of links become difficult, people bookmarking URLs with expired session IDs (so you need to handle expired session IDs, etc). Most modern phones, even non-smart phones, support cookies. Older phones may not. Whether you need to support cookieless sessions is up to you.
If your URL looked like this:
http://www.example.com/page.aspx
A cookieless URL would look like this:
http://www.example.com/(S(lit3py55t21z5v55vlm25s55))/page.aspx
Where lit3py55t21z5v55vlm25s55 is a session ID.
You can learn more about ASP.NET's session state here
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