Use Cookieless Sessions with Care

When a user visits a Web site for the first time, the site creates a unique ID, known as a Session ID. The Session ID is unique for that current Session, making it possible for the server to keep track of the user’s current Session information.

The Session ID is usually stored in the user’s cookies, using settings, like the following, in web.config:

 

If you decide to use a cookieless session, the session ID is, instead, stored as part of the URL, like this:

http://www.myapplication.com/(anf4vuup3xiq0arjlqla2l55)/WebForm1.aspx

If you do this, you must remember to use relative path URLs when linking between the pages of the Web site. Like this:

enquiryenquiry

While the following absolute URLs will work, you’ll lose the Session value if you use them.

enquiryenquiry

This is because absolute URLs automatically generate a new Session ID, so the existing Session ID is lost, along with all of its Session data.

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